On Tuesday, October 17, 1995 2:38 PM, Hans Ameel [SMTP:Hans.Ameel@PING.BE]
 wrote:
> Hi everybody,
>
> I am currently having a problem with a PIC 16C64,
> so Jaap van Ganswijk gave me the idea of posting
> it to this list...
>
> I already have some expirience with PIC 16C5x devices,
> but for this particular application (a RS232 control
> pannel), I needed some more I/O pins. So I chose the '64.
>
> I am using a Parallax PIC16Cxx programmer and a homemade
> 40 pin ZIF adapter for the '64.
> The adapter seems to work ok, since I am able te write,
> read and verrify the PIC. I use PASMX as assembler.
>
> But the PIC wont do a thing... even if all i try is
> putting a byte on one of the I/O ports...
>
> I did notice a lot has changed on this edition of
> the pic...  (no more MOV !RA,#?? instruction, the realocation
> of the reset vector, and the addition of a a GND and VCC pin)
> (Why does the pic needs 2 power pins ? do I have to connect
> them both??)

It wouldn't surprise me if you need to connect both power and ground pins.

I had a 68HC11 project where I used a pin that had multiple power and ground
pins.  I forgot to connect one of the power pins and it took me a long time
to figure out why I couldn't read from the on-board A/D.  Then I hooked up
that extra power pin and voila, A/D worked fine.

--Anil