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

Mark,

I think you need to use assembly language.
You haven't started talking to the PC yet but you are already facing timing problems with pulsein and pulseout.
If you use assembly, 20Mhz would be more than fast enough to do everything required.
I will help you with the assembly language if you need my help.

Another thing, I always use 1K resistors between the SX and the PC or notebooks and never had a problem.
I never needed the 8v supply for serial communications.
If you trust me on this, then the new board design need only one 5v regulator.

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