Hello.
I'm trying to make a program for a Scoreboard using a AT89S8252 in C, but I'm having some trouble doing the stopwatch, since I'm not familiar to C language and this is my first project.
The stopwatch would have 4 digits, two for seconds and two for minutes, going from 00:00 to 99:59.
If someone could give me some directions, or even the structure of the code, I would be able to continue.
Thanks a lot for the help,
Tntgsh.

 

Write a timer interrupt routine to interrupt, say, every 10ms

//--- Timer Interrupt Routine-----
// Runs every 10ms
void timekeeper(void) interrupt 1
{

TF0=0; // Reset Interupt Flag​

TH0=0xb1; // Next overflow in 10ms​

TL0=0xe0;
​

count++;​

if (count==100){ // 1 sec elapsed.​

count=0;​

timeToggle=1;​

sec++;​

if (sec==60){​

sec=0;​

min++;​

if (min==60){​

min=0;​

hr++;​

if (hr==24){​

hr=0;​

}​

}​

}​

}​

}