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

The long LED leg is plus, i.e. it should be connected via a 470 Ohm resistor to Vdd. Toe test the LED, disconnect the other wire going from the LED to the SX from the SX and connect it to Vss. The LED shoud turn on then. This makes sure that the LED is fine. If this is the case, something is wrong with the SX. Did you program it correctly? How do you clock the SX - from the SX-Key, or is there a resonator in the PDB socket?

Sorry, I can only guess here as you did not provide more details but "I programmed every thing right".

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