ch10_t7.asm

51单片机基础篇 对于有一定基础的人看看 包含书中所以的源代码

     ;PROGRAM NAME:T7.ASM
     ;TEST TIMER0 MODE 2:8-BIT COUNT UP
     ;
     COUNT 	EQU	92			;100μs FOR XTAL= 11.0592MHz
     CHK_BIT  	REG	P3.2
     LED	REG	P3.7
     ;
     		ORG	0
     		MOV	R0, #00H
     		DJN2	R0, $			;WAIT
     		CLR	CHK_BIT
     		MOV	SP, #40H
     ;
     		MOV	A, TMOD
     		ANL	A, #11110000B
     		CLR	ACC.3			;GATE=0
     		CLR	ACC.2			;C/T=0
     		SETB	ACC.1			;TIMER0 M1=1
     		CLR	ACC.0			;TIMER0 M0=0
     		MOV	TMOD, A
     		MOV	TH0, #(256-COUNT)
     		MOV	TL0, #00
     		CLR	TF0			;CLEAR TF0
     		SETB	TR0
     ;
     LOOP	JNB	TF0, LOOP		;TF0=0
     ;TF0=1
     OVER	CLR	TF0			;CLEAR TF0
     		CPL	CHK_BIT
     $NEXT	SJMP	LOOP
     ;