On 9/27/06, Vasile Surducan wrote: > Explain me at least one good reason why you need an optoisolated > programmer interface. > > Remember you'll never need to program a microcontroller directly > connected to power supply phase -or just to the earth- (for this job > you could disconnect the main connection while programming and pay a > little attention to the target design and supply ) You might want to do ICSP with Wisp628. You might want to debug it. Sometimes the ciruits have various isolated sections, may be high voltage or maybe not, but need to be isolated. That is why people are doing isolated Wisp628A and ICD2. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist