8051 microcontroller training (sahil gupta 9068557926)

Why do we need to learn
Microprocessors/controllers?
 The microprocessor is the core of
computer systems.
 Nowadays many communication, digital
entertainment, portable devices, are
controlled by them.
 A designer should know what types of
components he needs, ways to reduce
production costs and product reliable.

The necessary tools for a
microprocessor/controller
 CPU: Central Processing Unit
 I/O: Input /Output
 Bus: Address bus & Data bus
 Memory: RAM & ROM
 Timer
 Interrupt
 Serial Port
 Parallel Port

CPU
General-
Purpose
Micro-
processor
RAM ROM I/O
Port
Timer
Serial
COM
Port
Data Bus
Address Bus
General-Purpose Microprocessor System
Microprocessors:
 CPU for Computers
 No RAM, ROM, I/O on CPU chip itself
 Example ： Intel’s x86, Motorola’s 680x0
Many chips on mother’s board
General-purpose microprocessor

RAM ROM
I/O
Port
Timer
Serial
COM
Port
Microcontroller
CPU
 A smaller computer
 On-chip RAM, ROM, I/O ports...
 Example ： Motorola’s 6811, Intel’s 8051, Zilog’s Z8 and PIC
16X
A single chip
Microcontroller :

Microprocessor
 CPU is stand-alone, RAM,
ROM, I/O, timer are separate
 designer can decide on the
amount of ROM, RAM and
I/O ports.
 expensive
 versatility
 general-purpose
Microcontroller
• CPU, RAM, ROM, I/O and
timer are all on a single chip
• fix amount of on-chip ROM,
RAM, I/O ports
• for applications in which cost,
power and space are critical
• single-purpose
Microprocessor vs. Microcontroller

1. meeting the computing needs of the task efficiently and cost
effectively
• speed, the amount of ROM and RAM, the number of I/O
ports and timers, size, packaging, power consumption
• easy to upgrade
• cost per unit
1. availability of software development tools
• assemblers, debuggers, C compilers, emulator,
simulator, technical support
1. wide availability and reliable sources of the
microcontrollers.
Three criteria in Choosing a Microcontroller

Block Diagram
CPU
On-chip
RAM
On-chip
ROM for
program
code
4 I/O Ports
Timer 0
Serial
PortOSC
Interrupt
Control
External interrupts
Timer 1
Timer/Counter
Bus
Control
TxD RxDP0 P1 P2 P3
Address/Data
Counter
Inputs

Pin Description of the 8051Pin Description of the 8051
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
(RXD)P3.0
(TXD)P3.1
(T0)P3.4
(T1)P3.5
XTAL2
XTAL1
GND
(INT0)P3.2
(INT1)P3.3
(RD)P3.7
(WR)P3.6
Vcc
P0.0(AD0
)P0.1(AD1)
P0.2(AD2
)P0.3(AD3)
P0.4(AD4)
P0.5(AD5)
P0.6(AD6)
P0.7(AD7)
EA/VPP
ALE/PROG
PSEN
P2.7(A15)
P2.6(A14
)P2.5(A13
)P2.4(A12
)P2.3(A11
)P2.2(A10)
P2.1(A9)
P2.0(A8)
8051
(8031)

Pins of I/O Port
 The 8051 has four I/O ports
Port 0 （ pins 32-39 ）： P0 （ P0.0 ～ P0.7 ）
Port 1 （ pins 1-8 ）： P1 （ P1.0 ～ P1.7 ）
Port 2 （ pins 21-28 ）： P2 （ P2.0 ～ P2.7 ）
Port 3 （ pins 10-17 ）： P3 （ P3.0 ～ P3.7 ）
Each port has 8 pins.
○ Named P0.X （ X=0,1,...,7 ） , P1.X, P2.X,
P3.X
○ Ex ： P0.0 is the bit 0 （ LSB ） of P0
○ Ex ： P0.7 is the bit 7 （ MSB ） of P0
○ These 8 bits form a byte.
 Each port can be used as input or output (bi-
direction).

 RAM memory space allocation in the 8051
7FH
30H
2FH
20H
1FH
17H
10H
0FH
07H
08H
18H
00H
Register Bank 0
)Stack) Register Bank 1
Register Bank 2
Register Bank 3
Bit-Addressable RAM
Scratch pad RAM

Stack in the 8051
 The register used to access
the stack is called SP (stack
pointer) register.
 The stack pointer in the 8051
is only 8 bits wide, which
means that it can take value
00 to FFH. When 8051
powered up, the SP register
contains value 07.
7FH
30H
2FH
20H
1FH
17H
10H
0FH
07H
08H
18H
00H
Register Bank 0
)Stack) Register Bank 1
Register Bank 2
Register Bank 3
Bit-Addressable RAM
Scratch pad RAM

Interrupts
 Interrupt is an internal or external event that
suspends a program and transfers the control to an
event handler or ISR to handle the event.
 After the service is over the control is back to the
suspended program to resume the execution, The
microcontroller in a embedded system connects
many devices and need to handle service requests
from devices all the time.

Interrupt Enable
r :
 EA : Global enable/disable.
 --- : Undefined.
 ET2 :Enable Timer 2 interrupt.
 ES :Enable Serial port interrupt.
 ET1 :Enable Timer 1 interrupt.
 EX1 :Enable External 1 interrupt.
 ET0 : Enable Timer 0 interrupt.
 EX0 : Enable External 0 interrupt.

SEVEN SEGMENT DISPLAY
 The seven elements of the display can be lit in
different combinations to represent the Arabic
numerals.
 In a simple LED package, typically all of the
cathodes (negative terminals) or all of the anodes
(positive terminals) of the segment LEDs are
connected and brought out to a common pin; this
is referred to as a "common cathode" or "common
anode" device.
 Multiple-digit LED displays as used in pocket
calculators and similar devices used multiplexed
displays to reduce the number of I/O pins required
to control the display.
.
.

INTERFACING OF SEVEN SEGMENT
DISPLAY WITH 8051
. .

LIQUID CRYSTAL
DISPLAY
 A liquid crystal display (LCD) is a flat panel
display, electronic visual display, or video
display that uses the light modulating properties
of liquid crystals. Liquid crystals do not emit light
directly.
 Each pixel of an LCD typically consists of a layer
of molecules aligned between two
transparent electrodes, and two polarizing filters,
the axes of transmission of which are (in most of
the cases) perpendicular to each other.
. .

Applications in Industry
 Telecom
 Automotive applications
 Domestic applications
 Robotics
 Aerospace applications
 Medical equipment
 Defense systems

THANKYOU
ANYANY
QUESTIONS?QUESTIONS?

8051 microcontroller training (sahil gupta 9068557926)

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