Sometimes you need an erase first as the chip may be protected. Especially if you have been trying some flakey ICSP... KreAture ----- Original Message ----- From: "Chris Loiacono" To: Sent: Sunday, March 09, 2003 2:43 PM Subject: Re: ICSP anyone? > Thanks Dwayne...a good tip. the m'chip doc is very helpful - it really > validates all the replies tha cme from the list . > > Interestingly I can get a program into one 16f, but not another - even > though it has the same apparent conditions. > I'll have to see if there is something that's not so apparent..... > I will build a buffer on Monday and will also check on Vpp. > > Thanks to all. > > Chris > > > > If the power supply rise time does turn out to be the > > problem, Microchip > > has published an active buffer circuit for that as well. Its > > in lots of > > places: I simply did a search for the 2 terms PLUS ICSP (plus > > was shorthand > > for picstart plus) - one of the first hits was for the 12c508 but the > > buffer schematic was the same: > > /91017b.pdf> > > Have a look at the buffer circuit in appendix A: it has the advantage that > it allows Vdd to go to zero for those PICs that require Vpp to be applied > before Vdd. > > dwayne > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics