On Wed, Jan 14, 2004 at 03:09:55PM +0000, Peter Onion wrote:
> On Wed, 2004-01-14 at 13:07, Olin Lathrop wrote:
> > Peter Onion wrote:
> > > Q:  Is the ICSP spec for 18FXXX devices the same as it was for 16F877,
> > > or will I need to modify the programmer to use it with 18FXXX devices
> > > (IE is the ICSP spec the same) ?
> >
> > The electrical details like 13V on MCLR, clock on PGC, serial data on PGD
> > are the same.  The low level protocol is very different.
>
> Thats good !  Looks like NO hardware changes need to my programmer.
> Atleast I won't have to worry about getting that right again :-)

One change. The LVP pin is RB5 on 18F chips whereas it's RB4 on 16F.
A good idea is to ground both pins through a 10k resistor to ensure that
the pin stays grounded during the programming operation.

BAJ

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