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

Stef,

when debugging an SX with the SX-Key, or when you supply a clock frequency from the SX-Key to the SX under test, signal frequencies on the SX-Key OSC1 pin can go up to 50 MHz, or even more but they are always 20 MHz when the SX-Key communicates with the SX under test in debug mode. So an additional extension cable between the SX-Key and the 4-pin header on the device under test may add too much additional capacitive load for the clock signal. While programming, the signal frequencies on the OSC1 and OSC2 pins of the SX-Key are much lower, so this explains why programming with the extension cable works but debugging fails.

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