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

Stef,

    This is almost certainly a signal quality problem on the OSC traces.  I think the reason you do not see any problems when using the SX-Key is that it drives the SX chip with an active clock signal whenever connected.  The SX chip, when using any of the internal clocking methods, uses these pins as connections to a passive device.  I think you would see the same reliability improvement as given by the SX-Key by using an external 50Mhz TTL oscillator chip.

    If you happen to have access to a good high speed o-scope with FET input probes, I'd bet you would be able to diagnose and correct the problem quickly.  

    I have hit this sort of problem myself from time to time.  Would anyone else here have any tips on how to diagnose analog signal quality problems in the absence of a good o-scope?


John

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