In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

It is my understanding (and I hope someone with an authoritative answer will post) that having an external [B]RESONATOR[/B] connected to the SX at the same time the SX-Key is connected will not cause physical damage but will prevent the debugging features of the SX-Key from being available.  However, having an external [B]TTL OSCILATOR [/B]connected at the same time is very likely to cause damage to the SX-Key!

  I want to request clarification between the damage potential differences of having an eternal resonator versus an external TTL oscillator connected in conjuction with the SX-Key.

   - Sparks

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