Be careful with adding a cap to ground on your MCLR line. IIRC, the ICD2 manual discourages this practice because it can affect the timing with which the line is brought to Vpp. If you look in the ICD2 manual, you'll see a schematic which shows MCLR attached to Vdd through a resistor labelled 1k-10k. I like 10k myself; I feel a bit better about a slightly higher resistance between the 13V Vpp and the 5V (or less) Vdd. Mike H. > >Hi! > > > >What would be the best pullup resistor value to connect +5V to the /MCLR >to achieve the most stable operation? (I'm > >using PIC18F452) > > > >I've seen circuit diagrams with straight 5 volts, some with really high >resistors, and this given 'ICD ready' circuit > >with 47K Ohm... > > > >Regards, > > Jean-Pierre >It is not hugely critical - there is no 'best value'. >If you want to do in-circuit programming, you need to ensure that the >resistance is high enough not >to upset your programmer. > >Anything from 0 to 100K would probably fine for most applications. Higher >values will increase noise >pickup, so I'd suggest a maximum of 10K unless there is also a cap to >ground. > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. _________________________________________________________________ Take advantage of our best MSN Dial-up offer of the year six months @$9.95/month. Sign up now! http://join.msn.com/?page=dept/dialup -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.