10-7-1.asm

来自「书籍8051入门篇」· 汇编 代码 · 共 31 行

;10-7-1.ASM
$MOD51
MS10		EQU	-9217
TMH		EQU	(MS10) / 256
TML		EQU	(MS10) MOD 256
CNT		DATA	030H
		ORG	0000H
		LJMP	START
		ORG	000BH
		LJMP	T0_ISR
		ORG	0030H
START:		MOV	CNT,#0
		MOV	R0,#100
		MOV	TMOD,#11H
		MOV	TL0,#TML
		MOV	TH0,#TMH
		CLR	TF0
		SETB	TR0
		SETB	ET0
		SETB	EA
LOOP:		SJMP	LOOP
T0_ISR: 	MOV	TL0,#TML
		MOV	TH0,#TMH
		DJNZ	R0,EXIT
		MOV	R0,#100
		INC	CNT
		MOV	A,CNT
		CPL	A
		MOV	P1,A
EXIT:		RETI
		END