PIC unused pin problem

[Stefan van Greunen]

Hi

I have a problem with a PIC processor, which I think is related to the
unused pins on the processor. I have tried tying all the unused pins to
earth. I then tried to tie all the unused pins to positive supply. It
appears that the processor goes unstable - it stops running or runs faster
than what it is set to. Any suggestions?

S

 

[Brian Gregory [UK]]

"Stefan van Greunen" <greunen@xtra.co.nz> wrote in message
news:1A_pc.6319$XI4.221822@news.xtra.co.nz

Hi

I have a problem with a PIC processor, which I think is related to the
unused pins on the processor. I have tried tying all the unused pins
to earth. I then tried to tie all the unused pins to positive supply.
It appears that the processor goes unstable - it stops running or
runs faster than what it is set to. Any suggestions?

S

I generally just make sure unused pins are programmed to be outputs (and
left unconnected).

Any that can't be programmed as outputs connect to either rail via a
resistor (10k to 100k).

--

Brian Gregory (In the UK).
ng@bgdsv.co.uk
To email me remove the letter vee.