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Port pins too slow

Erwin Meyer

Hi..

I have a problem with the xc167ci. Its I/O-Pins toggle too slowly. If I have e.g. pin 4^0 toggeling, it only works with 2,85 MHz instead of 40 MHz (system clock).
I use the following sourcecode:

while(1)
{
P9_0 = 0;
P9_0 = 1;
}
In EBC-Mode the pins are pretty fast, they work on a 25 ns basis. Why does that not work on normal I/O-Pin operations?

Thanks,
Erwin

Parents
  • 0 in reply to Valentin Tihhomirov

    I do not think so, for EBC-timings for example work fine. The time between execution of two instructions is 25 ns, I measured that. The Factor between the pin toggle frequency and the oscillator frequency is 14. Do I work in a strange MODE like debug mode? (Debug itself is disabled).
    What other modes exist?

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  • 0 in reply to Valentin Tihhomirov

    I do not think so, for EBC-timings for example work fine. The time between execution of two instructions is 25 ns, I measured that. The Factor between the pin toggle frequency and the oscillator frequency is 14. Do I work in a strange MODE like debug mode? (Debug itself is disabled).
    What other modes exist?

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