----- Original Message ----- From: "Bob Ammerman" To: Sent: Thursday, July 11, 2002 3:15 PM Subject: Re: [PIC]: ICSP on 16F628 and MCLR > > I'm new to pics and need some help on a project I'm working on. > Can I do > > ICSP on a 16F628 if MCLR is internally tied to Vdd? Or does it matter when > > programming? Any help would be greatly appreciated. > > ICSP works even if the "MCLR" pin is defined to be a normal I/O pin. > > Bob Ammerman > RAm Systems MCLR may be defined for other uses if you don't need a hardware reset at run time, however.. If MCLR is tied directly to VDD, raising it to VPP will raise VDD to about 13 volts across the board. This could be bad for the PIC, and any other chips that happen to be sharing the (usually +5Volt) VDD line. It could also require more current than many simpler programmers can provide. Unless I misunderstand the question?? Lyle Hazelwood -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads