main.c

来自「QH_MCU_V1.1单片机C源码. 内含实验程序 这是修改版.」· C语言 代码 · 共 60 行

#include <reg51.h>

#define uchar unsigned char

void delay(uchar utimes)
{
    uchar i;
	uchar j;
	for(i=0;i<utimes;i++)
	   for(j=0;j<255;j++);

}

void Beep()
{
     P2 = 0x10;
     P0 = 0xf7;
     P2 = 0x00;
     P2 = 0x80;
     P0 = 0x01;
	 delay (100);
     P0 = 0x00;
     P2 = 0x00;
	 delay (50);
}

void isr_t0(void)interrupt 1 using 0
{
   static uchar cntr = 0;
   static uchar cntr1 = 0;
   EA = 0;
   cntr += 1;
   if(200==cntr)
   {
     cntr1 += 1;
	 cntr = 0;
   }
   if(100==cntr1)
   {
     Beep();
	 cntr1 = 0;
   }
   EA = 1;


}


void main()
{
   
   EA = 1;
   TMOD = 0x02;
   TH0 = 0x20;
   TL0 = 0x20;
   ET0 = 1;
   TR0 = 1;
   while(1);
}