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

You can have a crystal in circuit with the SX-Key/Blitz plugged in, but you cannot  :skull:  have one of those external oscillators in circuit at the same time.

The "internal osc" is basically, I believe, an R-C arrangement and hence the variation/inaccuracy.

The Key provides the timing in Debug mode.

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