>Can someone tell me what's instruction set test? > >It is supposed to be the execution of a set of instructions to verify if the >result of the instructions match a known value. If it doesn't, it indicates >the program has corrupted. Why do you want to do this? Performing an instruction test on a single chip micro seems rather pointless to me. Instruction tests used to be popular back when a computer was on a bunch of boards and there could be failurs inside the CPU. The likelyhood of blowing an individual transistor inside the CPU of a single chip micro is vanishingly small. When chips go bad, it is usually the I/O drivers, power related, or in the case of some PICs the flash could wear out. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads