I am looking at a pulse train coming in and have no problems when coding
with a 16C73A. I wish to use a 16F628 but it does not seem to work. I am
operating at 4MHz and have the XT option set. I do not have a WDT and am
only using the timer0 for an interrupt. It is such a simple program but I
am obviously missing something. The oscillator is OK and frequency is
correct. Power is OK (5 volts). The pulse train is 0-3 volts into RB5 which
is a TTL pin. I believe I have set all the required registers (CMCON is
loaded with 7). The configuration word looks OK. I am getting the correct
interrupts (every 100uS as I set an output pin and reset it) and this is OK
on an oscilloscope. Is there something funny with these chips I am missing?


TIA,

Peter

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