In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mumcs01 wrote:

Thanks! 

here is more info..... 

The SX does not start up, or run the program with the MCLR tied to Vdd via a 10K resistor and the SX-key plugged in. Unplug the SX-key, and the program starts up. Plug the key back in, and remove the 10K resistor and replace it with a wire, and the SX starts up as well. 

Attached is a schematic of my circuit. 'Port4' is were the SX key gets plugged in. If the circled part of the schematic is replaced with a 10K resisistor and the SX key is plugged into Port4, the SX does not operate.

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