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

Just to confirm, you can't use the ENABLE line on TTL oscillators and have the SX work right.  You must physically disconnect the oscillator's clock output from the SX clock input before using the SX-Key.  

How do I know?  Experience with a PCB I designed and had manufactured before testing the ENABLE concept.  Fortunately, I only had three prototypes made, so the investment wasn't that high.

Thanks,
PeterM

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