On Fri, 04 May 2007 17:21:30 -0400, Kevin wrote: > >But here's another question: why bother connecting Vpp to Vcc (using >that resistor) in the first place? Couldn't ICSP Vpp just connect to the >PIC's Vpp/MCLR pin without that resistor to Vcc? > The resistor pulls up the MCLR pin when the ICSP programmer is disconnected. If it were only being driven by the ICSP, disconnecting the programmer would leave the pin floating. Regards, Bob -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist