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8051 Microcontroller Assembly Language Program for Blinking LEDs
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| ORG 00H ; Assembly Starts from 0000H. | |
| ; Main Program | |
| START: MOV P1, #0XFF ; Move 11111111 to PORT1. | |
| CALL WAIT ; Call WAIT | |
| MOV A, P1 ; Move P1 value to ACC | |
| CPL A ; Complement ACC | |
| MOV P1, A ; Move ACC value to P1 | |
| CALL WAIT ; Call WAIT | |
| SJMP START ; Jump to START | |
| WAIT: MOV R2, #10 ; Load Register R2 with 10 (0x0A) | |
| WAIT1: MOV R3, #200 ; Load Register R3 with 10 (0xC8) | |
| WAIT2: MOV R4, #200 ; Load Register R4 with 10 (0xC8) | |
| DJNZ R4, $ ; Decrement R4 till it is 0. Stay there if not 0. | |
| DJNZ R3, WAIT2 ; Decrement R3 till it is 0. Jump to WAIT2 if not 0. | |
| DJNZ R2, WAIT1 ; Decrement R2 till it is 0. Jump to WAIT1 if not 0. | |
| RET ; Retu rn to Main Program | |
| END ; End Assembly |
rami1124
commented
Apr 3, 2022
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