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Spehro <speff@interlog.com> writes:
>>> You might want to look at the states of all the relevant registers on y=
our
>>> debugger.
>>=20
>> Yep, they come up as the datasheet claims (of course). But the debugger
>> also thinks everything should work...
>
> Rather than MPSIM, can you use a hardware debugger?  Otherwise you're
> working blind. Of course there is always the possibility it works only
> when debugging (usually some kind of initialization issue),

I've been a bit busy at work, but finally found some time to spend on
this tonight. I realised that the Pickit3 does actually do debugging, so
played around with it a bit, only swearing slightly at the horrific Java
monstrosity that is MPLAB-X.

Basically, it seems that the problem was enabling low-voltage
programming. I still don't understand why this interacted so strangely,
but disabling it seems to have fixed things. Grr.

Thank you everyone for the really helpful responses!

Rupert

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