> I've read the 16F628 datasheet but i'm still in the
> dark about one thing; if I do HVP ICSP using MCLR,
> and program the PIC to have the MCLR pin as an IO
> pin (ie set it to internal MCLR), can I then reprogram
> it *again* at a later date using HVP ICSP MCLR??

The *latest* programming specs for all PICs (not the original 16f628
programming spec!) that allow MCLR to be used as IO pin require an
enter-programming sequence where Vpp is applied *before* Vdd, so the
part can be re-programmed using HVP whatever the MCLR pin is configured
for. I dunno about LVP. The normal sequence (Vdd first, the Vpp) will
work most of the time, but often fails (at least on 12f628) when MCLR is
configured as IO.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body