Post by thread:2. try! 12c508 prog. problems!

Hello, After almost 24 hours my message has not appered, so I resend it: Hello all, I have some problems programming pic12c508 DIL chips. From one tube (60 pcs), 18 didnt work after programming, thats 30%, and I have no idea what could be wrong. I have programmed all in same way, with same source code, and on same PC... I am using win3.11, picstart plus programmer and mplab, all chips are programmed ok. I suspect the internal osc. to be the problem (Have not made any tests), all chips are programmed with internal masterclear and int. osc. (source uses int. osc.) Anybody have had the same problem ???? What could be wrong here.. best regards, tobias

Sorry list members, ccMail won't let me read Tobias's return address so I'll post this to the list Tobias, we got your message the last time, you need to send a message to spam_OUTLISTSERVTakeThisOuTMITVMA.MIT.EDU with the text PICLIST SET REPRO in the body of the message (you can leave the sybject blank) if you want to be able to read your own postings. The default is NOREPRO. CIAO - Martin. ______________________________ Reply Separator _________________________________ Subject: 2. try! 12c508 prog. problems! Author: pic microcontroller discussion list <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> at Internet Date: 6/3/98 11:48 PM Hello, After almost 24 hours my message has not appered, so I resend it: Hello all, I have some problems programming pic12c508 DIL chips. From one tube (60 pcs), 18 didnt work after programming, thats 30%, and I have no idea what could be wrong. I have programmed all in same way, with same source code, and on same PC... I am using win3.11, picstart plus programmer and mplab, all chips are programmed ok. I suspect the internal osc. to be the problem (Have not made any tests), all chips are programmed with internal masterclear and int. osc. (source uses int. osc.) Anybody have had the same problem ???? What could be wrong here.. best regards, tobias

At 11:48 PM 3/06/98 +0200, you wrote: {Quote hidden}>Hello, > >After almost 24 hours my message has not appered, so I resend it: > > >Hello all, > >I have some problems programming pic12c508 DIL chips. From one tube (60 >pcs), 18 didnt work after programming, thats 30%, and I have no idea what >could be wrong. > >I have programmed all in same way, with same source code, and on same PC... >I am using win3.11, picstart plus programmer and mplab, all chips are >programmed ok. I suspect the internal osc. to be the problem (Have not made >any tests), all chips are programmed with internal masterclear and int. >osc. (source uses int. osc.) > >Anybody have had the same problem ???? >What could be wrong here.. > > >best regards, >tobias > > Yes, I have had problems with this device, namely the calibration data. Check to ensure that you are not overwritting this area. Also when powering this deivce up, I am assuming that you don't use the external reset line, check the rise time. There has been a problem with a slow power rise time and the internal reset (Heared of only). You may need to speek to Microchip about this, the easy way around this is to enable the watchdog. (This breaks some of my brownout an power stuff opps) Dennis -=====================================================================- Dennis Plunkett: Embedded Hardware, Software design NEC Australia DRMASS ph 03 9264-3867 -=====================================================================-

i did see your original post (remember you the sender don't normally see you own posts) unless you set repo. my only guess would point to your programmer, maybe if you tried to reprogram the chips with the same data on a good production programmer the chips might work. if this fails i would contact microchip with the model number and date codes from the chips and see if there have been abnormal failures reported from the same batch. michael {Original Message removed}

Tobias Are you running the PICs at 3 volts? do they work if run at 5 volts? The picstart plus (all the picstarts I think) only verifies at 5Volts Steve Lawther ______________________________ Reply Separator _________________________________ Subject: 2. try! 12c508 prog. problems! Author: Tobias [SMTP:tobiasKILLspamEUNET.NO] at UKExchange Date: 03/06/98 22:48 Hello, After almost 24 hours my message has not appered, so I resend it: Hello all, I have some problems programming pic12c508 DIL chips. From one tube (60 pcs), 18 didnt work after programming, thats 30%, and I have no idea what could be wrong. I have programmed all in same way, with same source code, and on same PC... I am using win3.11, picstart plus programmer and mplab, all chips are programmed ok. I suspect the internal osc. to be the problem (Have not made any tests), all chips are programmed with internal masterclear and int. osc. (source uses int. osc.) Anybody have had the same problem ???? What could be wrong here.. best regards, tobias

On Thu, 4 Jun 1998, Steve Lawther wrote: > Tobias > > Are you running the PICs at 3 volts? do they work if run at 5 > volts? > [cut] HI, only those marked with letter 'L' in the type mark can run securely from 2 Volts (e. g. 16LC84) . Microchip guarantees working at minimum 4.5 V. Of course most work at 4 V, a bit fewer at 3.9 etc... So, believe Microchip! Imre