Andre Abelian wrote: > 1. when you enable pull-up resisters are they really resisters if > yes what value are they like 10k or some thing. Andre: The "weak pullups" are not actually resistors, but they act just like resistors with a value of approximately 20K. > 2. in short form card 16c62a when you see brawn out protection > YES is this means it has this brawn out protection built in it you > can enable it or disable it. Yes; the brown-out detection, on parts that include it, can be enabled or disabled via configuration fuses. > 3. what it the idea of pic16c62a RA4 to be always open collector > when you use it as output. Sometimes you just need an open-collector output... Among other things, it's useful for switching voltages larger than Vdd. > 4. since pic has power on reset what is the idea of having reset > pin that almost always pulled high. If you want an external device (like a watchdog circuit or something) to reset the PIC, you need a RESET pin. > 5. when you program pics and you got error massage is this means > pic was defective or I did some thing wrong. It could mean anything... On the PROMATE, it usually means that the socket module isn't aligned properly. > 6. when you use JW parts there is no frequency number on it is this > means it is good up 20 MHZ. Yes. > 7. when you use serial programing how many pics can be programed at > the same times. Just one... That is, you can't attach multiple PICs in parallel to one PROMATE. > 8. when you do serial number programing using PROMATE can you read > the serial number after code protection on if not what is the idea > to program serial number if you can not read it The PROMATE's "serialization" feature programs the serial number into the PIC's program memory as a series of RETLW instructions... The number can be read by the PIC just as numbers in any other lookup table can. -Andy === Andrew Warren - fastfwd@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499