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

Sparks,

Resonators and Xtals connected to the SX-Key in parallel are passive components - IOW, they will not impose any signals on the OSC1/OSC2 pins that might kill the SX-Key/SX-Blitz. A TTL Oscillator - on the other hand - is an active component, i.e. it generates an output signal, fed into the OSC1 pin. When an SX-Blitz/Key is attached in parallel, this might possibly kill the SX-Blitz/Key, or the TTL Oscillator, or - at least - prevent the SX-Blitz/Key from doing proper communications with the SX chip for programming, or debugging (this is also true in most cases when a resonator/Xtal is connected in parallel).

Therefore - whenever possible - it is a good idea to either socket the resonator/Xtal/TTL Oscillator so that it can be removed during programming/debugging sessions with the SX-Blitz/SX-Key, or to place a jumper allowing to isolate the OSC1 pin from any other components while programming/debugging the SX chip with an SX-Blitz/Key.

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