p16_1.asm

单片机原理与应用实例教程 单片机原理与应用实例教程

		ORG		0000H
		LJMP	MAIN
		ORG		0003H
		LJMP	INT_0
		ORG		3000H

MAIN:	SETB C
		MOV A, #00110011B
		SETB EX0
		SETB IT0
		SETB EA

LOOP:	MOV P0, A
		ACALL DELAY
		JNC CLKWISE
		RL A
		AJMP LOOP
CLKWISE:RR A
		AJMP LOOP

DELAY:	MOV R5, #0FFH
DL1:	MOV R6, #0FFH
DL2:	DJNZ R6, DL2
		DJNZ R5, DL1
		RET

INT_0:	CLR EX0
		ACALL DELAY
		CPL C
		SETB EX0
		RETI

		END