switchdebug.asm

能显示时间

ORG 0000H
AJMP MAIN
ORG 0030H
MAIN:
	MOV DPTR,#8000H
	MOV A,#0FFH
	MOVX @DPTR,A
MAINP:	MOV A,#0H
	ACALL SWITCH
	JNZ BEEP
	JZ NOBEEP
	AJMP MAINP

SWITCH:	
	MOV DPTR,#8000H
	MOVX A,@DPTR
	ANL A,#0FH
	RET



BEEP:	MOV P1,#0H
	AJMP MAINP
NOBEEP:	MOV P1,#0FFH
	AJMP MAINP
END