MPLAB simulator timer anomaly - differs from realtime.

[AlGeorge]

Using MPLAB with PIC10F206/int 4Mhz osc, MPLAB stopwatch says 948.031000 ms to line>> if (++seconds>59) below.
It says 47.400000 ms >> if (part_seconds<20) return;
This should mean the onboard clock will run way too fast, but in fact it is running much slower than the MPLAB stopwatch suggests on 4Mhz clock. EG a second anomaly per minute. See code below any suggestions please?

void Clock_Proc(void)
{
    static unsigned int timecheck;
    clrwdt ();                                    //if wdt enabled, this will reset
    astate=0;
    TMR0=Timer_offset;
    ++part_seconds;
    if (part_seconds<20) return;
    part_seconds=0;
    if (++seconds>59)

 

[Tahmid]

Hi,
Have you set the clock settings properly by selecting "Settings" under the "Debugger Menu"?

 

[AlGeorge]

Yes, if I hadn't, the difference would have been much more significant. The internal clock on those parts is fixed at 4Mhz.