Russell McMahon wrote:
>
> > I have an ITU pic programmer (parallel port) which works very nice when
> > programming 16C84 pics but which fails programming 16F84 pics. 16F84
> > pics are OK (I can program them with a serial programmer from a friend
> > of mine) and during a couple of days I even could program them in my ITU
> > programmer.
> >
> > Now, when I try to program them and I read the 16F84 pics I get all 0s and
> > the
> > code protect bit set.
>
> The biggest change between 16C84 and 16F84 is that the code protect bit is
> INVERTED.
> If programming a 16F84 in 16C84 mode you must set protect bit ON if you want
> it off.
>
> This does not appear to explain your total problem. but may be a factor.

It's the PWRTE bit that is inverted.

The code protection is a bit different also.

C84 only has 1 CP bit (bit 4)
F84 has bits 4 - 13 for CP bits


--
Best regards

Tony

mICro's
http://www.picnpoke.com
mailto:sales@picnpoke.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads