Ok, I'll just use a jumper to select between normal function & short to ground for programming. (It seems this is not in Microchip's ICSP Guide, but of course I could have missed it.) Thanks! Anthony Byron A Jeff wrote: On Thu, Sep 16, 2004 at 10:26:45AM -0700, Anthony Van Herrewege wrote: > Hi, > > When you program a PIC18F452 the RB5 pin needs to be grounded, but is that > also the case when you program it in system via a 5-pin header (MCLR, Vdd, > gnd, RB6 & RB7)? Yes. Even if it's only through a high valued resistor (33k). BAJ Website: http://members.lycos.nl/anthonyvh --------------------------------- Do you Yahoo!? vote.yahoo.com - Register online to vote today! _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist