On 4/23/07, Phillip Coiner wrote: > I copied the interface of my circuit from the schematic of a PICDEM 2 PLUS > development board from Microchip so that is how I ended up with the cap on > VPP. > Do you (or anyone else out there) have any idea why Microchip puts a 10nF on > VPP?? I'm wondering if I should remove it from the 16F676 design as well?? > I think a lot of the design has a 10nF (I've even seen 100nF) capacitors on the MCLR/Vpp pin for EMC reasons. I think you should put it there. As ProProg is positioned as a professional level programmer, I expect it to have better driving capability on Vpp pin as well. Recently Microchip announced some hardware changes for PICkit 2. One of them is to address the Vpp driving capability problem. Regards, Xiaofab -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist