> Date: Wed, 30 Aug 1995 17:20:20 +0100 > From: Wayne G Boyd > Subject: OTP devices > I have just developed an application for a PIC16c55. After checking > if worked correctly I decided to blow it onto a OTP device for the > final product. However, I got a fuse error report from the mps16b > program. Exact details bellow:- > > Developement EPROM chip : PIC16C55/JW-S1 > Final OTP chip : PIC16C55-XT/P Brian Read is wrong. There is one other difference between OTP and ceramic parts - the oscillator options are pre-set for OTP parts. That's why you have a -XT/P part instead of an -HS/P or a -RC/P part. > Clocking method : 8MHz Crystal > > I tried to program the OTP to use an HS clock. But it reported that > it had been programmed LP ! > Is there something I don't know about these OTP chips. I thought they > are supposed to be able to do everything the EPROM devices are. Yep, here's one thing to learn: you don't try to change the oscillator type to something other than what you bought. > Could it simply be that this OTP chip is defective ? Not likely. I've had this kind of problem with PICstart firmware V1.4 & software earlier than V3.04, trying to set crystal options to XT on a -XT/P part. > Anyone got any suggestions? If you're programming with the PICstart, get V1.7 firmware and V3.04 software (free from your distributor) upgrades. Don't try to set the crystal options to other than the part spec. > Thanks, > > Wayne G Boyd. You're welcome. I hope this was helpful. Tim Braun | Voice: 204-942-2992 ext 228 Continental Healthcare Systems Canada | FAX: 204-942-3001 1900-155 Carlton St | Email: tim@chs.mb.ca Winnipeg, Manitoba, Canada R3C 3H8 | www: http://www.chs.mb.ca/~tim/home.html