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

No, in fact, replacing the CPU a second time made the problem go away.  Although I don't know the mechanism, it would appear that the pin had been damaged by the circuitry.  Why that damage would exhibit itself in a 10 K pull up that could not be turned on or off I don't know.  Neither do I know what could have caused the damage.  I am adding a 1K series resistor to the design, which will isolate the pin from the load and hopefully prevent the possibility of this recurring.
 

Thanks

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