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

I am implementing an SX28 into an RS-232 application.  The breadboard version on the SX Tech Board works perfectly; the program is not the issue.  However, the PCB version does not appear to run.  I can write the program to the chip on the PCB without any trouble using the Key, but there is no signs of life past the programming.  If I run the same program on another chip on the Tech Board, it works.  Once soldered to the PCB, it doesn't.

Now here's the interesting part.  If I try to debug the PCB chip, the program downloads but then the debugger will open with [i]Running[/i] in the status, and none of the control buttons enabled (I cannot click 'Stop', 'Step', etc.).  The Reset button (on the debugger) is enabled, but does nothing visible when clicked.  This is exactly the same symptom as post #3 in [url=http://forums.parallax.com/forums/default.aspx?f=7&m=372386&g=373959][blue][b]THIS THREAD[/b][/blue][/url].

I have found I can duplicate this scenario by holding down the reset button on the Tech Board and then debugging (Ctrl+D).  The debugger opens in exactly the same state - [i]Running[/i], no buttons enabled.  So naturally it seems maybe my PCB chip is doing somewhat the same thing, although I have MCLR pulled high via a 10K.

I might insert that even a simple program does not work either.  I wrote a fast turn-an-LED-on program to test the PCB, and it still does not work.  I am using the internal 4MHz clock, so there is nothing external.  In fact, once it is programmed to run, the Tech Board chip will work every time when removing / applying power.  It is completely self-contained. 

Bottom line - Tech Board version works perfectly, PCB version does nothing.  I have MCLR pulled high through a 10K.  Am I missing something?

Thanks in advance.

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