micro controllers lecture notes unit 1 and 2

SRI G PULLA REDDY GOVT. POLYTECHNIC,
KURNOOL
Affiliated to STATE BOARD OF TECHNICAL EDUCATION &TRAINING, A.P .
Certified that this is the bonafied record of the work done by
Mr./Miss ______________________________________________________
of__________Diploma in __________________________________________
laboratory
Date: _________ Staff-in-charge
Head of the Department
PIN: _____________________
Submitted for the practical examination held on _________________________
Internal Examiner External Examiner _________________________________
External Examiner External Examiner _________________________________

INDEX
S.NO NAME OF THE EXPERIMENT DATE SIGNATURE
1
2
3
4
5
6
7
8
9

Experiment-1
Aim: To understand the 8051 programming environment in Edsim51 simulator and study
the circuit schematic.
Tools:
1. PC with OS Windows 7 or later.
2. Java Runtime Environment.
3. Edsim51-di(dynamic interface) simulator.
Results:
1. Edsim51-di simulator successfully installed.
2. Got accustomed to Edsim51-di interface.
3. Written an 8051 assembly language program, assembled and successfully executed.
4. Got accustomed to peripherals and their connections to 8051 in Edsim51-di.
Edsim51-di user interface and circuit schematic suitable for wire- wrapping is as
below:

Experiment-2
Aim: To experiment with 8051 instruction set covering addressing modes, arithmetic
instructions by performing addition of two 16-bit numbers
Tools:
Program:
ORG 0000H
MOV 21H, #0CDH ; Low byte of 1st 16-bit number
MOV 20H, #0ABH ; High byte of 1st 16-bit number
MOV 31H, #034H ; Low byte of 1st 16-bit number
MOV 30H, #012H ; High byte of 1st 16-bit number
;Above instructions used direct and immediate addressing
;modes
;Addition procedure
CLR CY
MOV A, 21H
ADD A, 31H
MOV 41H, A ;Move low byte of result into memory location
MOV A, 20H
ADDC A, 30H
MOV 40H, A ; Move high byte of result into memory location
;Final 16 bit answer in [CY][40H][41H]
END
Results:

Experiment-3
Aim: To experiment with 8051 instruction set covering addressing modes, arithmetic,
logical, jump and loop instructions by writing an 8051 assembly language program which
initialises all RAM locations to value ‘0’
Tools:
Program:
ORG 0000H
MOV R0,#126 ;R0 for storing count - 126 for all 128 minus
;2 locations
MOV R1,#02 ;R1 holds memory locations address and
;initialised to location 02H
LOOP:
MOV @R1,#00H ;Mov 00H into location pointed by R1
INC R1 ;Point to next memory location
DJNZ R0,LOOP ;Loop until count is 0
MOV 01H,#00H
MOV 00H,#00H
END
Results:

Experiment-4
Aim: To experiment with 8051 instruction set covering addressing modes, arithmetic,
logical, jump and loop instructions and also covers a method to access i/o port of 8051 by
writing an 8051 assembly language program which checks if a given number is prime or not.
If the given number is prime the program glows up an LED and if it’s not a prime then two
LED are glown. [Circuit schematic is as given in Experiment-1].
Tools:
Program:
ORG 0000H
MOV R0,#138 ;Given number is in register R0
MOV A,R0 ;
SUBB A,#2 ;Number of divisions to perform
MOV R1,A
CLR P1.0 ;Assume given number prime by lighting up an LED
MOV R2,#2 ;Start with number 2 as divisor
LOOP:
MOV A,R0 ;Mov dividend into A
MOV B,R2 ;Mov divisor into B
DIV AB ;Divide Dividend with divisor
MOV A,B ;Copy remainder into ACC
JZ NOTPRIME ;If not prime jump to code to light up
;another LED
INC R2
DJNZ R1,LOOP ;Decrement number of remaining
;divisions
SJMP ENDM ;Jump to end of program
NOTPRIME:
CLR P1.1
ENDM:
END
Results:

Experiment-5
Aim: To experiment with 8051 instruction set covering addressing modes, data transfer,
arithmetic, logical, jump and loop instructions by writing an 8051 assembly language
program to copy block of contents from code memory(ROM) to data memory(RAM).
Tools:
Program:
ORG 0000H
0000| LJMP CODE ;Instruction to jump to code
ORG 0003H ;Starting address of block of contents in
;ROM
DB "THIS CONTENT IN ROM IS COPIED TO RAM"
CODE:
0027| MOV R0,#36 ;Number of bytes to be copied in R0
0029| MOV R1,#20H ;Destination RAM address starting
002B| MOV R2,#00H ;Source index address
002D| MOV DPTR,#0003H ;Starting address of block of data
0030| MOV A,#00H ;Use ACC as index
LOOP:
0032| MOV A,R2
0033| MOVC A,@A+DPTR
0034| MOV @R1,A
0035| INC R1
0036| INC R2
0037| DJNZ R0,LOOP
END
Results:

Experiment-6
Aim: To experiment with 8051 instruction set covering addressing modes, data transfer,
arithmetic, logical, jump and loop instructions by writing an 8051 assembly language
program to find sum of first ‘n’ natural number where n is given in a register (limited to 8-bit
only).
Tools:
Program:
ORG 0000H
0000| MOV R0,#10 ;Given number
0002| MOV A,#00H ;ACC stores temporary results
LOOP:
0004| ADD A,R0 ;Add R0 to temporary Sum
0005| DJNZ R0,LOOP ;Decrement R0 and iterate again if
;not zero
;Final answer in ACC
END
Results:

Experiment-7
Aim: To experiment with 8051 instruction set covering configuration of inbuilt
timers/counters, interrupts, I/O operations, bit wise instructions by writing an 8051
assembly language program to blink an LED by generating a time delay using internal timer
and software interrupt.
Tools:
Note: Simulation results can be best viewed when system clock frequency is set to 12.0
MHz and screen update frequency is set to 50000 in the Edsim51-di control panel
settings.
Program:
ORG 000BH ;TIMER0 overflow interrupt vector address
000B| CPL P1.0 ;Very small ISR to update LED status
;Jump to another location if ISR code is
;not sufficiently small
000D| RETI ;Return from ISR
ORG 0000H ;8051 PC value on RESET/POWER ON
0000| LJMP 0050H ;JUMP to main program
ORG 0050H ;Main program code begins here
0050| MOV TMOD,#51H ;To configure TIMER0 in 16 bit timer
;mode
0053| SETB TCON.4 ;Start the timer
0055| MOV IE,#82H ;Enable Timer0 S/W interupt
END
Results:

Experiment-8
Aim: To experiment with 8051 instruction set covering all categories of instructions by
writing an 8051 assembly language program to read key presses into register B
Tools:
Note: Circuit schematic is as in Experiment-1
Program:
org 0000h
readkey:
clr f0 ;Flag to indicate if a key is pressed
mov p0,#6Fh ;Assume key in col0 is pressed
acall scanrows ;Scan each row and set flag if
;key in particular row is pressed
jb f0,col0 ;flag set indicates key in col0 is
;pressed
mov p0,#5Fh ;Assume key in col0 is pressed
acall scanrows
jb f0,col1 ;flag set indicates key in col0 is
;pressed
mov p0,#3Fh
acall scanrows
jb f0,col2
ljmp readkey ;Repeat row scanning continuously
col0:
mov B,r0 ;Key press is copied into B register
ljmp endm
col1:
dec r0
mov B,r0
ljmp endm
col2:
dec r0
dec r0
mov B,r0
endm:
ljmp readkey ;to read multiple keys
ljmp endx ;to halt after reading one key

scanrows:
jnb p0.0,row0 ;bottom row
jnb p0.1,row1 ;row 1 from bottom
jnb p0.2,row2
jnb p0.3,row3
ret
row0: ;code to copy corresponding key
;to reg r0
mov r0,#0Ch
setb f0
ljmp endp
row1:
mov r0,#09h
setb f0
ljmp endp
row2:
mov r0,#06h
setb f0
ljmp endp
row3:
mov r0,#03h
setb f0
ljmp endp
endp:
ret
endx:
end
Results:

Experiment-9
Aim: To experiment with 8051 instruction set covering all categories of instructions by
writing an 8051 assembly language program to read key press display each key pressed in
connected 7-segment display.
Tools:
Note: Circuit schematic is as in Experiment-1
Program:
org 0000h
ljmp readkey
db C0h
db F9h
db A4h
db B0h
db 99h
db 92h
db 82h
db F8h
db 80h
db 90h ;Codes Stored in ROM for displaying character in
;7-Segment
readkey:
clr f0
mov p0,#0EFh
acall scanrows
jb f0,col0 ;right most
mov p0,#0DFh
acall scanrows
jb f0,col1
mov p0,#0BFh
acall scanrows
jb f0,col2
ljmp readkey
col0:
mov B,r0
lcall display
ljmp endm
col1:

dec r0
mov B,r0
mov a,b
cjne a,#0bh,hjump ;here jump
mov B,#00h
hjump:
lcall display
ljmp endm
col2:
dec r0
dec r0
mov B,r0
lcall display
endm:
ljmp readkey ;to read multiple keys
ljmp endx ;to halt after reading one key
scanrows:
jnb p0.0,row0 ;bottom row
jnb p0.1,row1
jnb p0.2,row2
jnb p0.3,row3
ret
row0:
mov r0,#0Ch
setb f0
ljmp endp
row1:
mov r0,#09h
setb f0
ljmp endp
row2:
mov r0,#06h
setb f0
ljmp endp
row3:
mov r0,#03h
setb f0
ljmp endp
endp:
ret
;following display routine fetches code from ROM and
;sends it port to which 7-segment display is connected

display:
mov dptr,#0003
mov a,b
movc a,@a+dptr
mov p1,a
ret
endx:
end
Results:

micro controllers lecture notes unit 1 and 2

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