t1.c

单片机应用开发实例.rar

#include <reg52.h>
#include <stdio.h>
//------------------------------------------------
Timer 1 Interrupt Service Routine.
Set a breakpoint on 'overflow_count++' and run the
program in the debugger.  You will see this line
executes every 100 clock cycles (or 10,000 Hz).

So, overflow_count is actually a 1/10,000 sec
timer.
------------------------------------------------
static unsigned long overflow_count = 0;
void timer1_ISR (void) interrupt 3
{
overflow_count++;                               // Increment the overflow count 
}
void main (void)                                 //MAIN C 函数
{
//定时器1模式2，计数到255
TMOD = (TMOD & 0x0F) | 0x20;                   //设定模式 
TH1 = 256 - 100;                                 //TL1
TL1 = TH1;
ET1 = 1;                                       //开定时器1中断 
TR1 = 1;                                       //开定时器1
EA = 1;                                        //开中断 
//循环
while (1)
   {
   }
}