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

Just because the LED is on doesn't mean that Vdd and Vss are connected inside the chip.
The SX is going to use some amount of power, that power is going to make the LED light up.

What is the voltage measurement between the Vdd and Vss pins when you do this experiment ? If it's zero volts, then there is a problem (short).

Bean.

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