---- START NEW MESSAGE --- Received: from cherry.ease.lsoft.com [209.119.0.109] by dpmail10.doteasy.com with ESMTP (SMTPD32-8.05) id A432F45007C; Tue, 27 Jan 2004 16:37:06 -0800 Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <18.00CBFD03@cherry.ease.lsoft.com>; Tue, 27 Jan 2004 19:36:58 -0500 Received: from MITVMA.MIT.EDU by MITVMA.MIT.EDU (LISTSERV-TCP/IP release 1.8e) with spool id 6706 for PICLIST@MITVMA.MIT.EDU; Tue, 27 Jan 2004 19:36:53 -0500 Received: from MITVMA (NJE origin SMTP@MITVMA) by MITVMA.MIT.EDU (LMail V1.2d/1.8d) with BSMTP id 1560; Tue, 27 Jan 2004 19:36:49 -0500 Received: from rwcrmhc13.comcast.net [204.127.198.39] by mitvma.mit.edu (IBM VM SMTP Level 430) via TCP with ESMTP ; Tue, 27 Jan 2004 19:36:49 EST X-Comment: mitvma.mit.edu: Mail was sent by rwcrmhc13.comcast.net Received: from dragon (pcp04856710pcs.olathe01.ks.comcast.net[68.86.129.42]) by comcast.net (rwcrmhc13) with SMTP id <2004012800365101500kf6q0e>; Wed, 28 Jan 2004 00:36:51 +0000 X-Mailer: PocoMail 2.64 (1120) - Licensed Version Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Message-ID: <2004127183648.329362@dragon> Date: Tue, 27 Jan 2004 18:36:48 -0600 Reply-To: pic microcontroller discussion list Sender: pic microcontroller discussion list From: Matt Pobursky Subject: Re: [PIC:] Picstart plus as an in circuit programmer? (16F627A) To: PICLIST@MITVMA.MIT.EDU In-Reply-To: <6.0.1.1.2.20040127144521.0341dec0@pop.telusplanet.net> Precedence: list X-RCPT-TO: Status: U X-UIDL: 371856004 On Tue, 27 Jan 2004 14:56:06 -0700, Dwayne Reid wrote: > In fact, I'd like to pose that same question to the members of the > PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage > but fail to verify at the supply limits (either above or below the > programming voltage)? In other words, Vdd normal: pass, Vdd low: > pass, Vdd high: fail (or vice versa). Yes, back when I was first doing ICSP with my Picstart+ I had a few 16C65's that acted a little flaky after programming. I put them aside and several months later I purchased a ProPic2 ICSP programmer that does high/low voltage verify. I decided to check out the flaky 16C65 boards with the new ProPic2 programmer. They failed low voltage verify. For my own curiosity I re-programmed the questionable units (some with the ProPic2 and some with the Picstart+) and they all then verified at low voltage (and were no longer flaky). I've seen that happen with byte-wide EPROMS in days past also. BTW, the ProPic2 ICSP is an excellent ICSP programmer (and it's creator is a member of the PIClist even!) Octavio are you out there? ;-) http://www.propic2.com Matt Pobursky Maximum Performance Systems -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads .