Perhaps I should have mentioned the CPU I was emualting...Doh!

It's a 16F877.  On a related note, we need 3.3 volt capability so we are
going to need the 16LF877.  The standard chip is only specced down to 4
volts. I'm guessing this is limited because of the onboard Vpp generator?
Or are there probably other major differences?

> -----Original Message-----
> From: Rigby-Jones, Michael [PAI01:4837:EXCH]
> [SMTP:mrjones@europem01.nt.com]
> Sent: Friday, February 09, 2001 11:55 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC]: MPLAB ICE2000
>
> Has anyone successfully used one of the above to debug  in a circuit
> running
> at 3.3 volts?  I have been trying to get my I2C slave code working for
> nearly 3 days.  I have been getting all sorts of problems with the A/D
> converter returning odd numbers, the I2C slave acting up e.g. SDA being
> held
> low, missing acknowledges etc as well as extreme flakiness in MPLAB, such
> as
> breakpoints being totaly ignored and spurious stack under/overflows.  I
> have
> been furiously checking and rechecking the code to no avail.
>
> However, some time ago, I debugged some very similar code on this same
> emulator, although running at 5 volts.  Today my brain kicked in and I
> upped
> to voltage to 5 volts (which the rest of the circuit can tolerate, albeit
> at
> much increased current), et voila, it works perfectly.  I am a little
> pi$$ed
> off at the amount of effort I have put in only to find the dev tool is
> causing me more problems than my code ever did.  Unfortunately I don't
> have
> a 3.3 volt compliant ICD so I guess it's back to crash and burn debugging
> for now.
>
> I have followed the low voltage configuration of the ICE2000 to the
> letter.
> MPLAB says that power is being drawn from the target board, and that low
> voltage mode has been enabled.
>
> Any comments/suggestions?
>
> Regards
>
> Mike
>
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