8051 Program – port loopback

; port loopback
; read from port 0 and write back to port 1
	ORG 0H
	MOV P0, #0FFH	; make P0 an input port
	MOV P1, #0H	; make P1 an output port
BACK:	MOV A, P0
	MOV P1, A
	SJMP BACK
	END

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Related topics:
8051 Program - logical operation   |   8051 Program - parity generation   |   8051 Program - polling an io pin   |   8051 Program - send ascii to port   |   8051 Program - serializing data   |   8051 Program - simple serial transmission   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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