p8_2.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		0013H
		LJMP	INT_T0

		ORG		4100H
MAIN:	MOV DPTR, #CASE
		MOV R7, #0
		MOV A, #0
		MOV TMOD, #00000001B
		MOV TH0, #03CH
		MOV TL0, #0B0H
		SETB EA
		SETB ET0
		SETB TR0
LOOP:	JMP @A + DPTR

CASE:	AJMP TYPE0
		AJMP TYPE1
		AJMP TYPE2
		AJMP TYPE3
		AJMP TYPE4
		AJMP TYPE5
		AJMP TYPE6
		AJMP TYPE7

TYPE0:	MOV P1, #01011111B
		AJMP LOOP
TYPE1:	MOV P1, #10101111B
		AJMP LOOP
TYPE2:	MOV P1, #11110101B
		AJMP LOOP
TYPE3:	MOV P1, #11111010B
		AJMP LOOP
TYPE4:	MOV P1, #01010101B
		AJMP LOOP
TYPE5:	MOV P1, #10101010B
		AJMP LOOP
TYPE6:	MOV P1, #00000000B
		AJMP LOOP
TYPE7:	MOV P1, #11111111B
		AJMP LOOP

INT_T0:	INC R7
		CJNE R7, #20, RETURN
		INC A
		INC A
		CJNE A, #16, CLR_R7
		MOV A, 0
CLR_R7:	MOV R7, #0
RETURN:	MOV TH0, #03CH
		MOV TL0, #0B0H
		RETI
		
		END