How to avoid corrupting an EEPROM Write

[Melanie]

Take a look at this thread...

http://www.picbasic.co.uk/forum/showthread.php?t=360

Obviously you don't need the connection to the Battery. You need a large capacitor to act as a reservoir to keep the PIC alive long enough to complete an EEPROM write operation (10mS per byte). You simply detect that the power has failed (or not) by sampling the raw supply input and decide whether to proceed with the Write.

Personally I wouldn't bother... we manufacture hundreds of thosands of products annually, most have some kind of setup in EEPROM which can be user changed with Menu routines. I've yet to hear of a single instance where a system's been corrupted due a power outage. I'm not saying it can't happen, but I am saying that it's a seriously rare occurance that unless I was designing a Mission Critical application (aircraft, medical, elevator, chocolate dispenser kind of thing...) then I wouldn't worry about it.

[Ingvar]

Don't we just love those chocolates ....... *LOL* But seriously Mel, didn't you forget to mention creditcardreaders. It would surely be a disatser if we couldn't pay for our new shiny dominatrix leather boots just because the machine couldn't read our Visa

[Melanie]

I consider Chocolate as Mission Critical…

You know the Government tells us that we need to eat five portions of vegetables each day to stay healthy…

Chocolate comes from a bean… beans are pulses… pulses are right in the middle of the vegetable family, so that makes chocolate squarely a vegetable…

I believe everything our Government says… yup… every word…

PS… there is (almost) nothing as sensual as eating chocolate wearing just thigh-high dominatrix boots with long spiky heels… you should try it, it'll change your outlook on life forever…

[Ingvar]

That would definitely change my life forever. Waking up in the ER with two broken ankles and chocolate smeared all over my face .... some people would find that slightly embarrassing, myself included