Hello CocaColaKid,

CCK>>Can I leave this pin open or do I have to tie it somewhere? I would like to be able to minimize my part count and it seems that if I don't use a resistor pulled high I get mixed results. If I tie it to the Vdd it works great. Any ideas?<<

I always have the MCLR set as a input, and have had no problem. If it is set as a MCLR, you chip may or maynot work, depending on how you touch it... or things around it <g>. For a guarntee work, use a pull-up resister if you set it to MCLR instead of Input.

Some folks will go as far as putting a Pull-up there anyhow...I say try it... and if necessary do it.

CCK>>Also, would the internal pull up resistors have enough umf to work for a pull up on a Dallas DS1820? Again trying to minimize part count<<

I have not used a DS1820, but my guess, is that they do have enough Umph. I try to use the Internal Pullups whenever I can... I am like you.... the fewer the parts the better.

Dwayne