8051 Program – check for NULL

; check for NULL
	ORG 0H
	DATA1 EQU 10
MAIN:
	MOV A,#DATA1
	MOV R1,#0
	LCALL CHECK
	MOV R1,#DATA1
	LCALL CHECK
	SJMP MAIN
CHECK:
	SUBB A, R1
	JNZ notnull	; jump if A is not zero
	CLR P1.0	; P1.0 = low
	SJMP here
notnull:
	SETB P1.0	; P1.0 = high
here:	RET
	END

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Related topics:
8051 Program - find out of range data   |   8051 Program - ones and twos complement   |   8051 Program - check for NULL   |   8051 Program - 1ms delay   |   8051 Program - 1sec delay timer   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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