Program 1
org 00h
ljmp main
org 8100h
main:
mov a,#55
mov a,55h
mov a,r0
mov a,@r0
here:sjmp here
Program 2
org 00h
ljmp main
org 8100h
main:
MOV A,#55H ;load A with value 55H
MOV 40H,A ;copy A to RAM location 40H
MOV 41H,A ;copy A to RAM location 41H
MOV 42H,A
xx: SJMP xx
Program 3
org 00h
ljmp main
org 8100h
main:
MOV A,#55H ;load A with value 55H
MOV R0,#40H ;load the pointer. R0=40H
MOV @R0,A ;copy A to RAM R0 points to
INC R0 ;increment pointer. Now R0=41h
MOV @R0,A ;copy A to RAM R0 points to
xx: SJMP xx
Program 4 - LED Blink
org 00h
ljmp main
org 8100h
main:
MOV A,#55H ;load A with value 55H
back: MOV P1,A
ACALL DELAY
CPL A
ACALL DELAY
SJMP BACK
DELAY: MOV R0,#0FFH
MOV R1,#0FFH
MOV R2,#0FFH
L1: DJNZ R0,L1
L2: DJNZ R1,L2
L3: DJNZ R2,L3
RET
Program 5- Port data transfer
org 00h
ljmp main
org 8100h
main:
MOV A,#0FFH ;load A with value FFH
MOV P1,A
back: MOV A,P1
MOV P2,A
SJMP BACK
Program 6- LED_ON_OFF using embedded C
#include <reg51.h>
#defind LED P2;
void main(void)
{
P1=00; //clear P1
P2=0; //clear P2
for (;;) //repeat forever
{
P1++; //increment P1
P2++; //increment P2
}
}
Program 7- Time dealy using Timer
MOV TMOD,#01 ;Timer 0, mode 1(16-bit mode)
HERE: MOV TL0,#0F2H ;TL0=F2H, the low byte
MOV TH0,#0FFH ;TH0=FFH, the high byte
CPL P1.5 ;toggle P1.5
ACALL DELAY
SJMP HERE
DELAY:
SETB TR0 ;start the timer 0
AGAIN: JNB TF0,AGAIN ;monitor timer flag 0
;until it rolls over
CLR TR0 ;stop timer 0
CLR TF0 ;clear timer 0 flag
RET
