Post by thread:PIC12C508 date code/Internal oscillator problem

Can anyone tell me what the situation is with 12C508 date code 9813 - 9830? I've heard talk that Microchip screwed up their process, which messed up the factory calibration, so that the value stored in the chip was wrong. I can't find any info on Microchip's website, and no email reply yet. I saw some discussion to do with Playstation Modchips and the date codes, but I wasn't interested in them, so I deleted them at the time. TIA Paul

Paul, The UK microchip FAE has verbally stated that the chip meets the revised data sheet graphs, and that these graphs have changed since the last data sheet because of this - I pointed out that the rev C DS against the Rev B DS showed no changes, so he was going to get me actual values. This was last Tuesday - He hasn't come back to me, despite a phone call a day to him, (he's always in a meeting and will get back to me!) On another subject - Those on the PICList who remember me moaning about requesting the Microchip CDROM from their website and not getting it - I finally got the June '98 CDROM last week!!! Steve Lawther ______________________________ Reply Separator _________________________________ Subject: PIC12C508 date code/Internal oscillator problem Author: Paul BRITTON [SMTP:spam_OUTPaul.BRITTONTakeThisOuTMMSUK.CO.UK] at UKExchange Date: 03/08/98 11:45 Can anyone tell me what the situation is with 12C508 date code 9813 - 9830? I've heard talk that Microchip screwed up their process, which messed up the factory calibration, so that the value stored in the chip was wrong. I can't find any info on Microchip's website, and no email reply yet. I saw some discussion to do with Playstation Modchips and the date codes, but I wasn't interested in them, so I deleted them at the time. TIA Paul

Paul, I posted a similar question a couple of weeks ago, and was directed to http://www.dontronics.com . If you follow the links to the REI website and download the code which they've been "experimenting" with to correct the problem, you'll see that they simply add 0x10 to the factory-programmed OSCCAL value when programming the chips in the date range you mention. I doubt that this is a "Microchip-approved" approach to the problem, but it seems to work well enough for REI. (I haven't yet tried it myself, though I expect to soon). FYI, Mark >>> Paul BRITTON <.....Paul.BRITTONKILLspam@spam@MMSUK.CO.UK> 08/03/98 4:45 AM >>> Can anyone tell me what the situation is with 12C508 date code 9813 - 9830? I've heard talk that Microchip screwed up their process, which messed up the factory calibration, so that the value stored in the chip was wrong. I can't find any info on Microchip's website, and no email reply yet. I saw some discussion to do with Playstation Modchips and the date codes, but I wasn't interested in them, so I deleted them at the time. TIA Paul

Have a look at http://www.dontronics.com for more info {Quote hidden}> -----Original Message----- > From: Paul BRITTON [SMTP:Paul.BRITTONKILLspamMMSUK.CO.UK] > Sent: Monday, August 03, 1998 8:45 PM > To: .....PICLISTKILLspam.....MITVMA.MIT.EDU > Subject: PIC12C508 date code/Internal oscillator problem > > Can anyone tell me what the situation is with 12C508 date code 9813 - > 9830? > I've heard talk that Microchip screwed up their process, which messed > up > the factory calibration, so that the value stored in the chip was > wrong. > > I can't find any info on Microchip's website, and no email reply yet. > > I saw some discussion to do with Playstation Modchips and the date > codes, > but I wasn't interested in them, so I deleted them at the time. > > TIA > > Paul