In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

I think you missed the point Chris was trying to make.  You have left off the pull-up resistor on the /MCLR line and it has been stated by several people that this may not be a good idea and may cause the chip to misbehave.  I would try adding that just to see if it helps clear up the issue.  You are in your prototyping stage, correct?  If you add that and it gets better then try to find a way to add that part.  Using a surface mount resistor 0603 barely takes up any space on the PCB and there has to be a way to squeeze one on there.  I've hand soldered them (it is a bit tricky) to a board where someone wouldn't expect to be able to fit more parts on.  It sounds like you're adding a lot of other items that may or may not be needed and may be missing a potential problem with your board.

Robert

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