8255.asm

MCS51基本调试程序 包括8255、键盘、LED等

ORG	0000H
LJMP	MAIN
ORG	0100H
MAIN:
	CLR	EA
	SETB	P3.3
	MOV	A,#80H
	MOV	DPTR,#0C003H
	MOVX	@DPTR,A
	MOV	DPTR,#0C000H
	MOV	A,#00H
	MOVX	@DPTR,A
	MOV	DPTR,#0C001H
	MOV	A,#0FH
	MOVX	@DPTR,A
	MOV	DPTR,#0C002H
	MOV	A,#0FFH
	MOVX	@DPTR,A
END