Bill,

> I just did an MPLAB sim on your asm version.  It works as you=20
> would expect.

Great, it worked for both the 16F84 and 16F877 sim' targets and the =
16F84 hardware debugger but not the 16f877 (with small changes between =
the software versions for target compatibility).


> equates need to be moved up to 0x20 or higher.  Right now, they are in =
the=20
> middle of the SFRs.


Doh! O.K. That was me trying to hack something quick in ASM to prove a =
point. The Hitech C version should have all that sorted properly. It may =
be masking something however.


> is your program really working and your emulator just isn't showing =
you or is there really something=20
> wrong? =20

Ummm... I see. Yes I could execute some LED (pin) toggling in the ISR as =
a test and measure with my scope.
That would prove its rate is fixed or random.


> until we can sort out why TMR0 doesn't look like it works. =20

This might be the case. The code did call the ISR function but I didn't =
measure the period between calls, only stopped the debugger and checked =
the TMR0 register value. It may have just randomly hit 0 and triggered =
or in fact counted up and wrapped around as required.

> If not, might be time to call your emulator manufacturer and talk to =
him.

Its the MicroChip made ICD (In Circuit Debugger) with the latest (last =
week) downloaded firmware.

Thanks for your help
Pete

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