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- $MOD842
- ORG 00H
- JMP START
- ORG 03H
- CPL P2.4
- CPL P2.2
- CALL DELAY
- CPL P2.2
- CPL P2.0
- CALL DELAY
- CPL P2.7
- CPL P2.6
- SETB F0
- CALL DELAY
- JB F0,BW
- BW:
- MOV IEIP2, #0FFH
- CPL F0
- CALL DELAY
- CALL DELAY
- CALL DELAY
- JNB F0,BY
- BY:
- MOV IEIP2, #00H
- CPL P2.7
- CPL P2.6
- CALL DELAY
- CPL P2.2
- CPL P2.0
- CALL DELAY
- CPL P2.4
- CPL P2.2
- CALL DELAY
- RETI
- ORG 53H
- CPL P2.6
- RETI
- START:
- MOV IE,#81h
- MOV INTVAL, #1
- MOV TIMECON, #13H
- MOV SEC, #0
- MOV P2,#90H
- CALL DELAY
- JMP START
- DELAY:
- MOV R1,#50h
- DLY0: MOV R2,#050h
- DLY1: MOV R3,#0FFh
- DJNZ R3,$
- DJNZ R2,DLY1
- DJNZ R1,DLY0
- RET
- END
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