> In fact, I'd like to pose that same question to the members of the > PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage > but fail to verify at the supply limits (either above or below the > programming voltage)? In other words, Vdd normal: pass, Vdd low: > pass, Vdd high: fail (or vice versa). Yes, although it's not that applicable. Windowed parts will do that if they aren't erased enough. I've had flash AVR's, OTP PICs and 87LPC micros that would fail at supply limits. In all cases, the failure was repeatable. Verify at 5V is OK but at supply range, they'd fail and not always at the same location. After over-programming or erasing and reprogramming all is well. I don't think I've seen a flash PIC do it. I did have a lot of problems with a 1Mbit 5V flash rom a few years back but otherwise, it's pretty uncommon. Maybe one in a few thousand, if that. It does seem to be batch related. Steve. > > dwayne > > -- > Dwayne Reid > Trinity Electronics Systems Ltd Edmonton, AB, CANADA > (780) 489-3199 voice (780) 487-6397 fax > > Celebrating 19 years of Engineering Innovation (1984 - 2003) > .-. .-. .-. .-. .-. .-. .-. .-. .-. .- > `-' `-' `-' `-' `-' `-' `-' `-' `-' > Do NOT send unsolicited commercial email to this email address. > This message neither grants consent to receive unsolicited > commercial email nor is intended to solicit commercial email. > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads ========================================== Steve Baldwin Electronic Product Design TLA Microsystems Ltd Microcontroller Specialists PO Box 15-680, New Lynn http://www.tla.co.nz Auckland, New Zealand ph +64 9 820-2221 email: steve@tla.co.nz fax +64 9 820-1929 ========================================= -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads