ch10_t5.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:T5.ASM
     ;TEST TIMER0 MODE 1:16 BIT COUNT UP
     ;
     MS_100		EQU	30H
     COUNT		EQU 	9217			;10ms FOR XTAL=11.0592MHz
     CHECK_BIT REG	P3.2
     ;
     			ORG	0
     			MOV	R0, #00H
     			DJNZ	R0, $			;WAIT
     			CLR	CHECK_BIT
     			MOV	SP, #40H
     			MOV	MS_100, #00H	        ;CLEAR(MS_100)
     ;
     			MOV	A, TMOD
     			ANL	A, #11110000B
     			CLR	ACC.3			;GATE=0
     			CLR	ACC.2			;C/T=0
     			CLR	ACC.1			;TIMER0 M1=0
     			SETB	ACC.0			;TIMER0 M0=1
     			MOV 	TMOD, A
     			MOV	TH0, #(65536-COUNT)/256
     			MOV	TL0, #(65536-COUNT).MOD.256
     			CLR	TF0			;CLEAR TF0
     			SETB	TR0
     ;
     LOOP		JNB	TF0, LOOP		;TF0=0
     ;TF0=1
     OVER		CLR	TF0			;CLEAR TF0
     			MOV	TH0, #(65536-COUNT)/256
     			MOV	TL0, #(65536-COUNT).MOD.256
     			INC	MS_100			;INCREMENT COUNT
     			MOV	A, MS_100
     			CJNE	A, #10, $NEXT
     			CPL	CHECK_BIT		;P3.2 COMPLENENT
     			MOV	MS_100, #00H	        ;CLEAR COUNT
     $NEXT		SJMP	LOOP
     ;