It has LVP, I'll have to check on what state it's in.
The system is 5V.
MCLR has a cap to ground, but we pulled that off and no help.  MCLR is pull=
ed up with 10k, so taking that pin to high voltage would be ok.
Whenever the programmer tries to read from the chip I get zeroes.  Even the=
 new chips from Digikey.

This is reaching WAY back for me too.  An F84 project was how I first got i=
ntroduced to the piclist, back in maybe 95 or 96?  That one was a beacon tr=
ansmitter for 144-148MHz with a user program in EE, interpreted by code in =
flash, and changing the transmit frequency, CWID and a bunch of other featu=
res on the fly.  I still have a board or two somewhere.


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Sean Breheny
Sent: Wednesday, July 19, 2017 1:04 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] RE: PIC16LF73

Pulling a few things from the dark recesses of my memory:

Despite being an LF chip, maybe it needs 5V for programming? Or maybe it ca=
nnot operate at 5V and needs 3.3V?

Also, is this one of those chips which had a low-voltage programming method=
 and needed a pin (called LVP?) pulled high or low to ensure proper operati=
on of the normal ICSP method?

Sean


On Wed, Jul 19, 2017 at 1:32 PM, Van Horn, David < david.vanhorn@backcountr=
yaccess.com> wrote:

> Still having no luck.
> I got some fresh F73 parts from Digikey, and the programmer looks like=20
> it's unable to communicate with the chip.
> Is there a wiring guide that covers this specifically?   I need a known
> working starting point.
>
> Sometimes, doing someone a favor is way more complicated than it looked.
>
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20
> View/change your membership options at=20
> http://mailman.mit.edu/mailman/listinfo/piclist
>
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