fangbo1.c

用单片机产生方波的一个小程序。 方波的频率为1HZ.

#include<regx51.h>
#define TIMER0_COUNT  0XFC18
int timer0_tick;

static void timer0_isr(void) interrupt TF0_VECTOR using 1
{TR0=0;
 TL0=(0XFC18&0X00FF);
 TH0=(0XFC18>>8);
 TR0=1;
 timer0_tick++;
 if(timer0_tick==1000)
   timer0_tick=0;
   P2=~P2;
 }

static void timer0_initialize(void)
{EA=0;
 timer0_tick=0;
 TMOD&=0XF0;
 TMOD|=0X01;
 TL0=(0XFC18&0X00FF);
 TH0=(0XFC18>>8);
 PT0=0;
 ET0=1;
 TR0=1;
 EA=1;
 }

 void main(void)
{timer0_initialize();
 while(1);
 }