Post by thread:[PIC]: misterious problems when programming pics 1

I would greatly appreciate that somebody could give a clue on a subject that puzzles me : 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 program does not run in my prototype board, while the 16C84 version does (so, I guess that it is not a code protection issue, but a bad programming one) Do have the 16F84 and the 16C84 some difference from the programming point of view which could explain this behaviour? The software I am using is Picprg32 for WinNT (in a W2000 environment) from Nigel Goodwin. Thanx for your attention Joan Ilari -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

In-Reply-To: <.....AKECIHMGACMKNJCEIMAJOEEJCAAA.joan_ilariKILLspam@spam@eic.ictnet.es> joan ilari <joan_ilariKILLspamEIC.ICTNET.ES> wrote: {Quote hidden}> 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 program does not run in my prototype board, > while the 16C84 version does (so, I guess that it is not a code protection > issue, but a bad programming one) > > Do have the 16F84 and the 16C84 some difference from the programming > point of view which could explain this behaviour? The software I am using > is Picprg32 for WinNT (in a W2000 environment) from Nigel Goodwin. Yes the programming spec for the 16F84 is slightly different from that for the 16C84. I think a bit in one of the commands is inverted or something. Brian Gregory. .....briangKILLspam.....cix.compulink.co.uk -- http://www.piclist.com hint: To leave the PICList EraseMEpiclist-unsubscribe-requestspam_OUTTakeThisOuTmitvma.mit.edu

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

> 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. I met this problem with a tait style programmer, I found that the 16F84 was less tolerant of Vpp voltage variation. It should be 12v. at the Vpp pin. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Dyson's Contrarotator(TM) is the first washing machine with 2 drums rotating in opposite directions at once. This means it gives the cleanest wash results in the fastest time and takes the largest loads. The Contrarotator(TM) is now on sale at selected retailers, and will be available nationwide in spring 2001. For more information, please visit our website at http://www.dyson.com. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* -- 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