timer.c

来自「为电子工业出版社的51单片机C语言常用模块与综合系统设计实例精讲随书光盘」· C语言 代码 · 共 27 行

#include <at89x52.h>
#include <stdio.h>
#include <absacc.h>
#include <intrins.h>
#define FOSC18432
#ifdef  FOSC18432
	#define TIMER2H           		0xc4 //10ms
	#define TIMER2L           		0x00
#else
#ifdef  FOSC24M
	#define TIMER2H           		0xB1 //10ms
	#define TIMER2L           		0xE0
#endif
#endif
void start_t2imer(void){
    T2CON=0X00;
	RCAP2L=TIMER2L; //10ms
	TL2=TIMER2L;
	RCAP2H=TIMER2H;
	TH2=TIMER2H;
 	ET2=1;//enable timer2 interrupt
	TR2=1;//start timer
}
void stop_t2imer(void){
	ET2=0; //disable timer2 interrupt
	TR2=0; //stop timer2 counter;
}