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STM8L151C8T6 LQPF48 PIN13/VLCD how to connect? When I'm not using VLCD function,this pin is must be tied to VDD? What would happen if there was NC?

cguol
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MUST means MUST and not optionally, so on STM8L151xx Devices, the VLCD pin MUST to be tied to MCU VDD.