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

The USB-SXKey is not providing an power to your circuit.  I'm guessing that you don't have a stable clock source connected to the chip; when the Key is connected a stable clock is there; without it you're ragged.  The LED blinking after the disconnect of the Key is evidence that the chip is running -- that the Pololu is not responding means the serial bit rate is bad and you should be able to see this with a 'scope.

BTW, for 50MHz I tend to use OSCHS2, have found other settings (with the resonators I use) don't work well.

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