Jon,

 Have you thought about the 'Oscillator Calibration Value' and
 any differences between that in the 'JW' part vs. the OTP?
 I wouldn't think the calibration of the internal oscillator
 would differ that nuch from each other, but you never can tell.
 Also, check to make sure the unused peripherals are in the state
 you think they're in.  I'll keep thinking.

                                         Regards,

                                           Jim



On Thu, 24 February 2000, Jon Petty wrote:

>
> HI
>
> I have been having problems programming PIC12CE674 OTP chips with my
> PicStartPlus. The JW version of the chip works fine, but the OTP doesn't work
> at all or the timing delays take 70 times longer. I used foil over JW window
> to make sure ram wasn't being initialized by ambient light, the JW chip still
> worked as designed. Microchip sent me some OTP samples to make sure the chip
> was good (they had the same OTP problem). I downloaded the latest firmware
> for the PicStartPlus, still no fix. I have the latest version of MPLAB.
>
> What could it be? The JW chips all work fine.
>
> Has anyone successfully used a PicStartPlus to successfully program
> PIC12CE674 OTP with Internal oscillator (noclockout), internal mclr, powerup
> timer On and watchdog timer ON?
>
> Any help, hints, suggestions?
>
> I have got to have 2 prototypes ready for delivery on Monday. Getting
> desperate!
>
> Thanks in advance
>
> Jon

jim@jpes.com