On Wed, 28 May 2003, Wouter van Ooijen wrote:

> >     I always thought that one could interchange between OTP and flash
> > b'cos it was the same thing but the erasing was different. Am I wrong?
>
> You can mix OTP and JW (windowed) because they are the same chips (just
> different packaging). To my knowledge (TMK?) there are no PIC types that
> are available both as OTP and as flash, so interchange would be limited
> to the compatibility of the two different chips.

More to the point, you can't erase OTP parts at all...  OTP = One Time
Programmable.  It's an EPROM part with no window for erasing.

EEPROM (JW parts): Quartz window, can be erased and re-programmed, just
DON'T SET CODE PROTECTION.  Expensive, usually only used for development.

OTP parts: Same as EEPROM, but all plastic with no window for erasing.
Usually used for production or other "permanent" uses.

FLASH parts: Can be erased and re-written electrically thousands of times.
Good for dev and production.

Dale
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