8051 Program – hex up and down counters

; hex/binary counters
	ORG 0H
	SJMP 30H
	ORG 30H
	MOV A,#00
UP:	MOV P0,A
	ACALL DELAY
	INC A
	CJNE A,#0FFH,UP
DOWN:	MOV P0,A
	ACALL DELAY
	DEC A
	CJNE A,#0,DOWN
	SJMP UP
DELAY:	MOV r1,#0FFH
DECR1:	MOV r2,#0FFH
DECR:	MOV r3,#0FFH
	DJNZ r3,$
	DJNZ r2,DECR
	RET
	END

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Related topics:
8051 Program - up counter 8bit   |   8051 Program - down counter 8bit   |   8051 Program - bcd up counter 8bit   |   8051 Program - bcd down counter 8bit   |   8051 Program - bcd up and down counters   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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