How to use the timer counter of C51 microcontroller?-EEWORLD

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There are many methods, here is one for you, you can debug it, you can use different crystals to calculate the initial value of the timer, if you understand the timer part, it is very easy to adjust
#include
sbit p1_0=P1^0;
int i; //global variable

void timing(void) //the crystal is 3.6864M
{
TMOD|=0x01; //timer T0, working mode 1
TH0=0xC3;
TL0=0xC7; //these two registers store the starting value of the counter, these two values are accumulated to overflow, it is exactly 50ms
ET0=1; //enable T0 interrupt to overflow
EA=1; //enable total interrupt
TF0=0; //clear overflow bit
TR0=1; //enable T0
}
/********timing interrupt function************/
void time0_int () interrupt 1 //timing interrupt function
{
TH0=0xC3;
TL0=0xC7;
i++;
}

main()
{
  i=0;
  timing();
  while(;)
  {
if(i==20)
{
   p1_0=~p1_0; //p1.0 port status flip
      i=0;
   }
  }
}

Keywords：C51 Reference address：How to use the timer counter of C51 microcontroller?

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