PICDEM2PlusUserGuide.pdf

 2011 Microchip Technology Inc. DS41584A
PICDEM™ 2 Plus
Demonstration Board
User’s Guide

DS41584A-page 2  2011 Microchip Technology Inc.
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logo, rfPIC and UNI/O are registered trademarks of
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chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
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© 2011, Microchip Technology Incorporated, Printed in the
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ISBN: 978-1-61341-248-0
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:2002 certification for its worldwide
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and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.

PICDEM™ 2 PLUS DEMONSTRATION
BOARD USER’S GUIDE
 2011 Microchip Technology Inc. DS41584A-page 3
Table of Contents
Preface ........................................................................................................................... 5
Chapter 1. Introduction
1.1 Introduction ............................................................................................. 11
1.2 Development Kit Contents ...................................................................... 11
1.3 PICDEM™ 2 Plus Demonstration Board ................................................ 11
1.4 On-Board Jumper Configurations ........................................................... 13
1.5 Sample Devices ...................................................................................... 13
1.6 Sample Programs ................................................................................... 14
Chapter 2. Getting Started
2.1 PICDEM™ 2 Plus Demonstration Board as a Stand-Alone Board –
Preprogrammed Device .......................................................................... 15
2.2 Programming the Device ........................................................................ 16
2.3 Powering the Board ................................................................................ 20
Chapter 3. Tutorial
3.1 Tutorial Program Operation .................................................................... 23
3.2 Source Code and Application Notes ....................................................... 28
Appendix A. Hardware Detail
A.1 Processor Sockets .................................................................................. 31
A.2 Display .................................................................................................... 31
A.3 Power Supply ......................................................................................... 31
A.4 RS-232 Serial Port .................................................................................. 31
A.5 Switches ................................................................................................. 32
A.6 Oscillator Options ................................................................................... 32
A.7 Analog Input ........................................................................................... 32
A.8 ICD Connector ........................................................................................ 32
A.9 PICkit™ Connector ................................................................................. 32
A.10 Temperature Sensor ............................................................................... 32
A.11 Serial EEPROM ...................................................................................... 32
A.12 LCD ........................................................................................................ 32
A.13 Sample Devices ...................................................................................... 33
A.14 Board Layout and Schematics ................................................................ 34
Worldwide Sales and Service .................................................................................... 38

PICDEM™ 2 Plus Demonstration Board User’s Guide
NOTES:

Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the
PICDEM™ 2 Plus Demonstration Board. Items discussed in this chapter include:
• Document Layout
• Conventions Used in this Guide
• Warranty Registration
• Recommended Reading
• The Microchip Web Site
• Development Systems Customer Change Notification Service
• Customer Support
• Document Revision History
DOCUMENT LAYOUT
This document describes how to use the PICDEM™ 2 Plus Demonstration Board as a
development tool to emulate and debug firmware on a target board. The manual layout
is as follows:
• Chapter 1. “Introduction” – Introduces the PICDEM 2 Plus Demonstration
Board and provides a brief description of the hardware.
• Chapter 2. “Getting Started” – Goes through a basic step-by-step process for
getting your PICDEM 2 Plus Demonstration Board up and running as a
stand-alone board or with an ICE, ICD or PICkit™ programmer.
• Chapter 3. “Tutorial” – Provides a detailed description of the tutorial program.
• Appendix A. “Hardware Detail” – Describes in detail the hardware of the
PICDEM 2 Plus Demonstration Board.
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help.
Select the Help menu, and then Topics to open a list of available online help files.

CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic characters Referenced books MPLAB®
IDE User’s Guide
Emphasized text ...is the only compiler...
Initial caps A window the Output window
A dialog the Settings dialog
A menu selection select Enable Programmer
Quotes A field name in a window or
dialog
“Save project before build”
Underlined, italic text with
right angle bracket
A menu path File>Save
Bold characters A dialog button Click OK
A tab Click the Power tab
N‘Rnnnn A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
4‘b0010, 2‘hF1
Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>
Courier New font:
Plain Courier New Sample source code #define START
Filenames autoexec.bat
File paths c:mcc18h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’
Italic Courier New A variable argument file.o, where file can be
any valid filename
Square brackets [ ] Optional arguments mcc18 [options] file
[options]
Curly brackets and pipe
character: { | }
Choice of mutually exclusive
arguments; an OR selection
errorlevel {0|1}
Ellipses... Replaces repeated text var_name [,
var_name...]
Represents code supplied by
user
void main (void)
{ ...
}

Preface
WARRANTY REGISTRATION
Please complete the enclosed Warranty Registration Card and mail it promptly.
Sending in the Warranty Registration Card entitles users to receive new product
updates. Interim software releases are available at the Microchip web site.
RECOMMENDED READING
This user’s guide describes how to use PICDEM™ 2 Plus Demonstration Board. Other
useful documents are listed below. The following Microchip documents are available
and recommended as supplemental reference resources.
Readme for PICDEM™ 2 Plus Demonstration Board
For the latest information on using the PICDEM™ 2 Plus Demonstration Board, read
the “Readme for PICDEM™ 2 Plus Demonstration Board.txt” file (an ASCII
text file) in the Readmes subdirectory of the MPLAB IDE installation directory. The
Readme file contains update information and known issues that may not be included in
this user’s guide.
Readme Files
For the latest information on using other tools, read the tool-specific Readme files in
the Readmes subdirectory of the MPLAB IDE installation directory. The Readme files
contain update information and known issues that may not be included in this user’s
guide.
Reference Documents
Reference documents may be obtained by contacting your nearest Microchip sales
office (listed in the back of this document) or by downloading via the Microchip web site
(www.microchip.com). Recommended documents include:
• Individual data sheets and reference manuals:
- PIC16(L)F193X Data Sheet (DS41364)
- PIC18(L)F2X/4XK22 Data Sheet (DS41412)
- PIC16(L)F1826/27 Data Sheet (DS41391)
- PICmicro® Mid-Range MCU Family Reference Manual (DS33023)
- PICmicro®
18C MCU Family Reference Manual (DS39500)
- TC74 Data Sheet (DS21462)
• MPLAB® IDE Simulator, Editor User’s Guide (DS51025)
• MPASM™ Assembler, MPLINK™ Object Linker, MPLIB™ Object Librarian
User’s Guide (DS33014)
• PRO MATE® 3 User’s Guide (DS51464)
• MPLAB® IDE PICSTART® Plus User’s Guide (DS51028)
• MPLAB®
ICE Emulator User’s Guide (DS51159)
• MPLAB® ICD 3 In-Circuit Debugger Quick Start Guide (DS51766)

THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.
To register, access the Microchip web site at www.microchip.com, click on Customer
Change Notification and follow the registration instructions.
The Development Systems product group categories are:
• Compilers – The latest information on Microchip C compilers and other language
tools. These include the MPLAB C18 and MPLAB C30 C compilers; MPASM™
and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30 object linkers;
and MPLIB™ and MPLAB LIB30 object librarians.
• Emulators – The latest information on Microchip in-circuit emulators.This
includes the MPLAB ICE 2000 and MPLAB ICE 4000.
• In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 2.
• MPLAB® IDE – The latest information on Microchip MPLAB IDE, the Windows®
Integrated Development Environment for development systems tools. This list is
focused on the MPLAB IDE, MPLAB SIM simulator, MPLAB IDE Project Manager
and general editing and debugging features.
• Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 and PRO MATE®
II device programmers and the PICSTART®
Plus and PICkit™ 1 development programmers.

Preface
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision A (June 2011)
• Initial Release of this Document.
Note: This board (DM163022-1) has been updated from the previous version
(DM163022).The user guide for the previous board version (DM163022)
can be found online at the PICDEM 2 Plus web site (DS51275)
www.Microchip.com/PICDEM2PLUS.

NOTES:

Chapter 1. Introduction
1.1 INTRODUCTION
Thank you for purchasing the PICDEM™ 2 Plus Demonstration Board from Microchip
Technology Incorporated. The PICDEM 2 Plus Demonstration Board is a simple board
that demonstrates the capabilities of Microchip’s 8-bit, 18-, 28- and 40-pin PIC16FXXX,
PIC16F1XXX, and PIC18 devices.
The PICDEM 2 Plus Demonstration Board can be used stand-alone with a
programmed part, with an in-circuit emulator (for example, MPLAB®
REAL ICE™) or
with an in-circuit programmer/debugger (such as MPLAB®
ICD 3 or PICkit™ 3).
Sample programs are provided to demonstrate the unique features of the supported
devices.
1.2 DEVELOPMENT KIT CONTENTS
The PICDEM 2 Plus Demonstration Board kit comes with the following:
• PICDEM 2 Plus Demonstration Board (see Figure 1-1)
• Sample devices (pre-loaded with program demonstration)
If you are missing any part of the kit, please contact your nearest Microchip sales office
listed in the back of this publication for help.
1.3 PICDEM™ 2 PLUS DEMONSTRATION BOARD
The PICDEM 2 Plus Demonstration Board has the following hardware features:
1. 18-, 28- and 40-pin DIP sockets
(although three sockets are provided, only one device may be used at a time)
2. On-board, +5V regulator for direct input from 9V, 100 mA AC/DC wall adapter or
9V battery, or hooks for a +5V, 100 mA regulated DC supply
3. RS-232 socket and associated hardware for direct connection to an RS-232
interface
4. Programmer/debugger connectivity supporting MPLAB ICD 3, MPLAB REAL
ICE and PICkit 3
5. PICkit Serial Connector for analysis of serial communications peripherals such
as SPI or I2
C™
6. 5 k pot for devices with analog inputs
7. Three push button switches for external stimulus and Reset
8. Power-on indicator LED
9. Four LEDs connected to PORTB
10. On-board external oscillators including:
a) 4 MHz, canned crystal oscillator (Y2)
b) RC oscillator circuit (R4, C3)
c) Unpopulated holes for crystal connection (Y1)
d) 32.768 kHz crystal for Timer1 clock operation (Y3)

11. 32K x 8 Serial EEPROM
12. LCD display
13. Piezo buzzer
14. Prototype area for user hardware
15. Expansion Header for PICtail™ daughter card connectivity or user access to
MCU pins
16. Microchip TC74 thermal sensor
FIGURE 1-1: PICDEM 2 PLUS DEMONSTRATION BOARD HARDWARE
:
:
MPICDEM™ 2 PLUS
DEMO BOARD
PICKIT
PICKIT
SERIAL
PWR
9V BATTERY
PICtail™
1
2
3
5

6
7
9
8
10
11
12
13
15
16

Introduction
1.4 ON-BOARD JUMPER CONFIGURATIONS
Most of the on-board components have associated jumpers that will allow the user to
either connect or disconnect a component(s) from the PIC®
MCUs or other mounted
components. Table 1-1 and Figure 1-2 detail these connections.
FIGURE 1-2: PICDEM™ 2 PLUS DEMONSTRATION BOARD JUMPER
LOCATIONS
1.5 SAMPLE DEVICES
Two Flash devices are included. The device types may change, but will generally
include PIC16 and PIC18 40-pin, DIP devices.
TABLE 1-1: ON-BOARD JUMPER CONNECTIONS
Jumper Connection
J6 LEDs to PORTB
J7 On-board RC oscillator to PIC®
MCUs
J9 Piezo buzzer to RC2 pin (*on 40-pin mid-range device, this is CCP1)
J10 VCAP connection for devices with on-chip voltage regulator
J12 2.7V source to RA1 (voltage divider off of 9V input voltage)
J14, 15, 16, 17 PICkit™ Serial Header to I2
C™ bus
J18,19 Tx and Rx from RS-232 components to PIC MCUs
J20, 21, 22, 23 PIC MCUs to I2C bus
J24 RA4 pin to RC2 pin (*on 40-pin mid-range device, this connects C1OUT to
CCP1)
:
:
MPICDEM™ 2 PLUS
DEMO BOARD
PICKIT
PICKIT
SERIAL
PWR
9V BATTERY
J6
J7
J12
J19
J18
J14
J15
J16
J17
J20
J21
J23
J22
J9
J10
J24

1.6 SAMPLE PROGRAMS
The PICDEM™ 2 Plus Demonstration Board kit sample demonstration programs can
be found on the Microchip web site (www.microchip.com/PICDEM2PLUS). These
programs may be used with the included sample devices, with a REAL ICE (In-Circuit
Emulator), MPLAB®
ICD 3 (programmer/debugger) or with a PICkit™ 3
(programmer/debugger). For each type of device (PIC16 or PIC18), demo source code
(several .C and .H files) and compiled code (one .hex file) are provided.

Chapter 2. Getting Started
The PICDEM™ 2 Plus Demonstration Board may be used as a stand-alone board with
a preprogrammed device, with an In-Circuit Emulator (ICE), with an In-Circuit Debug-
ger (ICD) or with a PICkit™ programming device. For a list of PIC® microcontroller
compatible ICEs, ICDs or PICkit programming devices, see the Development Systems
Ordering Guide.
2.1 PICDEM™ 2 PLUS DEMONSTRATION BOARD AS A STAND-ALONE BOARD
– PREPROGRAMMED DEVICE
The PICDEM 2 Plus Demonstration Board may be demonstrated immediately by
following the steps listed below:
• Place the preprogrammed sample device in the appropriate socket on the
PICDEM 2 Plus Demonstration Board.
• Confirm the jumpers are populated/removed according to Table 2-1 below.
• Connect the programmer/debugger. See Section 2.2 “Programming the
Device”.
• Apply power to the PICDEM 2 Plus Demonstration Board. See
Section 2.3 “Powering the Board”.
TABLE 2-1: JUMPER SETUP

To reprogram the sample device, the following will be necessary:
• Program source code – user source code may be used to program the device, or
if this previously has been done, the sample program may be restored from the
file included in the PICDEM 2 Plus installer.
• An assembler, such as MPASM™ assembler (available with MPLAB® IDE), or a
compiler, such as HI-TECH® C or MPLAB C18 (PIC18 devices only).
Source code must be assembled or compiled into a hex file before it can be pro-
grammed into the device. Microchip Technology’s MPASM assembler, HI-TECH or C18
C compilers may also be used. Both are compatible with MPLAB IDE.
Other assemblers/compilers may be used. For a list of these PIC MCU compatible lan-
guage tools, see the Microchip web site (www.microchip.com).
Once the sample program is in hex file format, a programmer can program a Flash
device. Microchip Technology’s PICkit or ICD 3 programmer may be used. Both are
compatible with MPLAB IDE.
Other programmers may be used. For a list of these PIC MCU compatible program-
mers, see the Microchip web site (www.microchip.com).
If the code protection bit(s) have not been programmed, the on-chip program memory
can be read out for verification purposes.
2.2 PROGRAMMING THE DEVICE
The PICDEM 2 Plus Demonstration Board supports the ability to program a device
through multiple options.
2.2.1 PICkit Programming
FIGURE 2-1: PICkit™ PROGRAMMER AND BOARD CONNECTION
HEADER
Microchip’s PICkit 3 In-Circuit Debugger/Programmer uses in-circuit debugging logic
incorporated into each chip with Flash memory to provide a low-cost hardware debug-
ger and programmer.

Getting Started
Connecting the PICkit programmer to the PICDEM 2 Plus Demonstration Board is
quick and easy.
• First connect the PICkit 3 as shown in Figure 2-1.
• Make sure to connect the USB cable to the PICkit 3 and to the computer.
• Enter MPLAB and go to either the Debugger or Programmer tab. Select the
PICkit 3 as shown in Figure 2-2.
FIGURE 2-2: CONNECTING A PICkit PROGRAMMER

2.2.2 ICD Programming
FIGURE 2-3: ICD PROGRAMMER AND BOARD CONNECTION HEADER
The MPLAB® ICD 3 In-Circuit Debugger System is Microchip’s most cost-effective,
high-speed hardware debugger/programmer for Microchip Flash Digital Signal Control-
ler (DSC) and microcontroller (MCU) devices. It debugs and programs PIC® Flash
microcontrollers and dsPIC® DSCs with the powerful, yet easy-to-use graphical user
interface of MPLAB Integrated Development Environment (IDE).
Connecting the ICD 3 to the PICDEM 2 Plus Demonstration Board is quick and easy.
• First connect the ICD 3 as shown in Figure 2-3.
• Make sure to connect the USB cable to the ICD 3 and to the computer.
• Enter MPLAB and go to either the Debugger or Programmer tab. Select the ICD
3 as shown in Figure 2-4.

Getting Started
FIGURE 2-4: CONNECTING AN ICD

2.3 POWERING THE BOARD
The PICDEM 2 Plus Demonstration Board supports the ability to power the board
through multiple options.
2.3.1 External 9V Connector
FIGURE 2-5: 9V EXTERNAL POWER SUPPLY
The PICDEM 2 Plus Demonstration Board can be powered with an external 9V power
supply.
• Connect 9V power supply to a wall outlet.
• Connect to board as shown in Figure 2-5. The on-board regulator will reduce the
input voltage to 5V for safe PIC device operation.
2.3.2 External 9V Battery
FIGURE 2-6: 9V EXTERNAL BATTERY
The PICDEM 2 Plus Demonstration Board can be powered with an external 9V battery
for a power supply.
• Connect the 9V battery to the board [B].
• The on-board regulator will reduce the input voltage to 5V for safe PIC device
operation.

Getting Started
2.3.3 Power by Programmer
FIGURE 2-7: 5V SUPPLIED BY PROGRAMMER
The PICDEM 2 Plus Demonstration Board can also be powered with a PICkit or ICD
programming device.
• To power the device with a programmer go to either the Debuggger/Programmer
tab.
• Scroll down to Settings. Then go to the Power tab.
• Click the checkbox labeled “Power target circuit from MPLAB (programmer type)”.
Select 5V as the voltage.
• The board will now be powered through the programmer.

NOTES:

Chapter 3. Tutorial
The tutorial program is preprogrammed into the sample device. The PIC16 device’s
program was built using the HI-TECH C compiler and the PIC18 device’s program was
built using the C18 compiler. These programs are included in the PICDEM™ 2 Plus
installer file found at www.Microchip.com/PICDEM2PLUS.
In case the device has been reprogrammed to a user’s unique code, the device can
always be reprogrammed with the tutorial program if installed.
For detailed information on the PICDEM 2 Plus hardware, please refer to Appendix
A. “Hardware Detail”.
3.1 TUTORIAL PROGRAM OPERATION
The tutorial program is made up of four components, which are individually displayed
on the LCD.
3.1.1 Voltmeter
FIGURE 3-1: VOLTMETER DISPLAY AND COMPONENT
This mode uses the A/D module to measure the voltage of the RA0 pot (R16) and dis-
play a voltage between 0.00V and 5.00V on the LCD.
Voltage is continually updated until the mode is exited by pressing RB0.
FIGURE 3-2: TEMPERATURE READINGS
Reading the Voltmeter Display (ADC)
A) (ADRESH:ADRESL) ADC conversion result. Range: 10-bit (0-1023).
B) Voltage representation.

3.1.2 Buzzer
FIGURE 3-3: BUZZER DISPLAY AND COMPONENT
This mode turns on the Piezo buzzer using the CCP1 module I/O pin, RC2.
FIGURE 3-4: FIGURE 3-4: BUZZER READINGS
The period and duty cycle of the CCP1 frequency can be changed while the buzzer is
on. The changes in period are recognized immediately in the buzzer tone. By changing
the period, the buzzer frequency changes.
• To change the period, press RB0 under the “Buzzer” menu.
• The buzzer will sound off with the default frequency of 10 kHz and a period of 05h
(0%).
• By pressing the RB4 button the period will increase by 5 (2%).
• The LCD will display the current Key being played by the buzzer based upon the
period.
• Press RB0 to exit the buzzer function.
Figure 3-3 shows an example of a signal supplied to the buzzer.
Reading the Buzzer Display (PWM)
A) PWM Period Percentage. Range (0-100%) Frequency (10 kHz-250 Hz).
- Please refer to Table 3-1 for a index of Period, PWM%, Frequency and Key.
B) This is the key being played based on the frequency being supplied to the speaker.
C) Increase the PWM period by 2%.

Tutorial
FIGURE 3-5: BUZZER SIGNAL
TABLE 3-1: BUZZER INDEX

3.1.3 Temperature
FIGURE 3-6: TEMPERATURE DISPLAY AND COMPONENT
This mode uses a TC74 thermal sensor to measure ambient temperature in Celsius
and then display the temperature on the LCD. The user has the option to change the
display between Celsius and Fahrenheit by pressing RB4.
Communication between the PIC MCU and sensor is accomplished using the MSSP
module. This mode is exited by pressing RB0.
FIGURE 3-7: TEMPERATURE READINGS
3.1.4 Temperature Fault
If during I2
C communication a time-out Fault occurs the LCD display will indicate the
Fault as shown in Figure 3-8.
FIGURE 3-8: TEMPERATURE COMMUNICATION FAULT
Reading the Temperature Display
A) Display current temperature at given unit of measurement
B) Change the unit of measurement.

Tutorial
3.1.5 Clock
FIGURE 3-9: CLOCK DISPLAY
The Real-Time Clock will start counting from 00:00:00 at the start of the program.
The Timer1 module and a 32 kHz clock crystal are used to establish a Real-Time Clock.
By pressing RA4 within the clock function, the clock time can be set to the user’s pref-
erence. The user has the option to set the hours or minutes of the clock.
FIGURE 3-10: INCREMENT/DECREMENT HOURS
By pressing RA4 within the set function, the user can set the hours. The user first has
the option to increment the hours, one hour at a time by pressing RA4. If the user
presses RB0 within the increment hour’s function, the program will then allow the user
to decrement the hours, one hour at a time by pressing RA4. When the user presses
RB0 again the program will return to the clock display screen.
FIGURE 3-11: INCREMENT/DECREMENT MINUTES
By pressing RB0 within the set function, the user can set the minutes. The user first has
the option to increment the minutes, one minute at a time by pressing RA4. If the user
presses RB0 within the increment minute’s function, the program will then allow the
user to decrement the minutes, one minute at a time by pressing RA4. When the user
presses RB0 again the program will return to the clock display screen.

3.1.6 USART
FIGURE 3-12: USART DATA IN HYPERTERMINAL
The data displayed on the LCD within all the program functions is also sent to the
RS-232 serial port using the USART on the PIC MCU. A HyperTerminal program on the
PC will be able to display the same information that is displayed on the LCD.
3.2 SOURCE CODE AND APPLICATION NOTES
In addition to the assembled tutorial program (hex files), source code used to create
these hex files are included in the PICDEM 2 Plus installer. Both source code and
related hex files are found in device-specific directories.
A digital guide is also included with the installer.
For information on how to reprogram the device with new or modified code, or how to
restore the tutorial program, please see Section 2.1 “PICDEM™ 2 Plus Demonstra-
tion Board as a Stand-Alone Board – Preprogrammed Device”.

Tutorial
FIGURE 3-13: TUTORIAL PROGRAM FLOWCHART
Power-Up
PICDEM™ 2 Plus
Welcome Screen
Voltmeter
RA4 = Next
RB0 = Now
Buzzer
RA = Next
RB0 = Now
Temperature
RA4 = Next
RB0 = Now
Clock
RA4 = Next
RB0 = Now
Volts = 3.3V
[0681] RB0 = Exit
PWM:044% Key:C5
RA4 = +2% RB0 = Exit
USART
Transmit
Temp = 23° [C]
RA4 = [F] RB0 = Exit
Time 00:00:00
RA4 = Set RB0 = Menu
RA:[HR] 00:00:00
RB:[MIN] TIME
00:00:00 *[HRS]
RA:++/-- RB:Next
00:00:00 *[MIN]
RA:++/-- RB:Next
RB0
RB0
RB0
RB0
RA4
RB0 RB0 RB0
RA4
RA4
RA4
RA4
RA4

NOTES:

Appendix A. Hardware Detail
The PICDEM™ 2 Plus Demonstration Board hardware is extremely simple and illus-
trates the ease-of-use of various PIC MCUs. This section describes the PICDEM 2 Plus
Demonstration Board hardware elements.
A.1 PROCESSOR SOCKETS
Although three sockets are provided, only one device may be used at a time.
• 18-pin socket
• 28-pin socket
• 40-pin socket
A.2 DISPLAY
• Four green LEDs are connected to PORTB of each processor type.
• PORTB pins are set high to light the LEDs. These LEDs may be disconnected
from PORTB by removing jumper J6.
• One red LED is provided to indicate whether there is power to the PICDEM 2 Plus
Demonstration Board.
• LED On = Powered. LED Off = Not Powered
A.3 POWER SUPPLY
There are multiple ways to supply power to the PICDEM 2 Plus Demonstration Board:
• A 9V battery can be plugged into J8.
• A 9V, 100 mA unregulated AC or DC supply can be plugged into J2. A power sup-
ply can be purchased through Microchip, part #AC162039.
• A +5V, 100 mA regulated DC supply can be connected to the hooks provided.
MPLAB® ICE 2000 users have a regulated +5V power supply available in the logic
probe connector and can easily connect to the header (J4) on the PICDEM 2 Plus
Demonstration Board. (Red probe to +5V and Black probe to GND.)
MPLAB ICD or PICkit™ programmer users may use the programmer to power the tar-
get board to 5V, up to 200 mA, if the MPLAB programmer is connected to the PC.
A.4 RS-232 SERIAL PORT
An RS-232, level-shifting IC has been provided with all the necessary hardware to sup-
port connection of an RS-232 host through the DB9 connector. The port is configured
as DCE and can be connected to a PC using a straight-through cable.
The PIC16/PIC18 RX and TX pins are tied to the RX and TX lines of the MAX232A.

A.5 SWITCHES
Three switches provide the following functions:
• S1 – MCLR to hard reset the processor
• S2 – Active-low switch connected to RA4
• S3 – Active-low switch connected to RB0
Switches S1 and S3 have debounced capacitors, where as S2 does not, allowing the
user to investigate debounced techniques.
When pressed, the switches are grounded. When idle, they are pulled high (+5V).
A.6 OSCILLATOR OPTIONS
• 32.768 kHz (watch-type) crystal for Timer1.
• Removable, 4 MHz, canned oscillator.
• Space for a user defined oscillator crystal.
A.7 ANALOG INPUT
A 5Ω potentiometer is connected through a series 470Ω resistor to AN0.
The pot can be adjusted from VDD to GND to provide an analog input to the parts with
an A/D module.
A.8 ICD CONNECTOR
By way of the modular connector (J5), the MPLAB ICD can be connected for low-cost
debugging. The ICD connector utilizes RB6 and RB7 of the microcontroller for in-circuit
debugging.
A.9 PICkit™ CONNECTOR
By way of the header connector (J11), the MPLAB PICkit can be connected for low-cost
debugging.
A.10 TEMPERATURE SENSOR
This is a serial digital thermal sensor (TC74) connected to the 28- and 40-pin microcon-
trollers via RC3 and RC4.
Communication is accomplished with the TC74 via its 2-wire I2C compatible serial port.
This device has an address of ‘0b1001101’.
A.11 SERIAL EEPROM
A 24L256 (32K x 8) serial EEPROM is included on the board to illustrate I2
C bus con-
cepts.
A.12 LCD
An LCD display with two lines, 16 characters each, is connecting to the 28 and 40-pin
sockets. There are three control lines (RA3:RA1) and four data lines (RD3:RD0).
A 5kΩ pot may be installed into R20 to adjust contrast on the LCD. If this is done, R5
and R6 need to be removed.

Hardware Detail
A.13 SAMPLE DEVICES
A sample part programmed with a simple program is included in the PICDEM 2 Plus
Demonstration Board kit. Table A-1 lists the I/O features and port connections for each
processor type.
TABLE A-1: PORT CONNECTIONS
Device LEDs RS-232 S1 S2 S3
Pot
R16
LCD EEPROM Buzzer ICD
Temp
Sensor
Y1/Y2
18-pin RB3:RB0 N/A MCLR RA4 RB0 RA0 N/A N/A N/A RB6/RB7 N/A Yes
28-pin RB3:RB0 RC6/RC7 MCLR RA4 RB0 RA0 RC3/RC4 RA3:RA1 RC2 RB6/RB7 RC3/RC4 Yes
40-pin RB3:RB0 RC6/RC7 MCLR RA4 RB0 RA0 RC3/RC4 RA3:RA1
RD3:RD0
RC2 RB6/RB7 RC3/RC4 Yes

A.14 BOARD LAYOUT AND SCHEMATICS
The following figures show the part layout (silkscreen) and schematics for the PICDEM
2 Plus Demonstration Board.
FIGURE A-1: PICDEM™ 2 PLUS DEMONSTRATION BOARD PARTS LAYOUT

Hardware Detail
FIGURE A-2: PICDEM™ 2 PLUS DEMONSTRATION BOARD SCHEMATIC

FIGURE A-3: PICDEM™ 2 PLUS PIC16F1937 PINOUT
FIGURE A-4: PICDEM™ 2 PLUS PIC18F86K22 PINOUT

PICDEM™ 2 Plus Demonstration Board User’ Guide
NOTES:

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05/02/11

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