Hello Russel,

Below is the code I am referencing. It updates TH0 without shutting off any interrupts which is considered bad programming practices. My question is with such abundant resources (free 9,900 Microseconds to thumb twiddle each timer 0 interrupt) as in this program why bother with shutting off interrupts.

The comment about the peanut gallery was to try to get comments limited to this example and leave person opinions out of the discussion.

Regards,

Charles Bannister

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void timer_isr (void)  interrupt 1  using 1  {
	TH0 |= 0xdc;  // reload timer 0 with 0DC00H
	cputick++;
	time();       // update realtime clock
         
}

===================================================
void time ()
/* update real-time clock  */
{
   sec100++;
   if (sec100 >= 100)       /* 100 * 10 ms = 1 s */
   {sec100 = 0;
    flag1 |= 0x05;   /* set bit 0, bit 2 */
    temp = 50;
    sec++;
    if (sec >= 60)
    {sec = 0;
     flag1 |= 0x02; /* set bit 1 */
     min++;
     if (min >= 60)
     {min = 0;
     hour++;
     if (hour >= 24)
     {hour = 0;

    }
  }
 }
}
}