嘀、嘀.asm

刚学时编的小程序

		WEI BIT 55H
		ORG 0000H
		LJMP MAIN
		ORG 000BH
		LJMP T0X
MAIN:	MOV SP,#60H
		CLR P3.6
		MOV TMOD,#01H
		MOV TH0,#(65536-500) / 256
		MOV TL0,#(65536-500) MOD 256
		SETB EA
		SETB ET0
		SETB TR0
		SJMP $

T0X:	MOV TH0,#(65536-50000) / 256
		MOV TL0,#(65536-50000) MOD 256
		INC R0
		CJNE R0,#20,LOOP1
		MOV R0,#0
		CPL WEI
		CPL P3.6
LOOP1:	JB WEI,LOOP2
		CPL P3.6
LOOP2:	RETI

		END