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FAQ
Why can’t the GPIO PA0 and PA1 pins in the NuMicro® NUC442/NUC472 series be normally output to the High voltage level? Issue Date：2016-08-18
Since the power source of GPIO PA.0 and PA.1 pins in the NUC442/NUC472 series is from the VBAT pin, different from the power supply of other GPIO pins from VDD. Thus, it is necessary to provide a constant power supply to the VBAT pin. The VBAT pin shall not be floating; otherwise, the PA.0 and PA.1 pins cannot be output to the High voltage level.
The following shows the NUC442/NUC472 series power distribution diagram.
| Products: | Microcontrollers ,Arm Cortex-M4 MCUs ,NUC442/472 Series |
|---|---|
| Applications: | |
| Function: | Peripherals,Clock Control,LXT,I/O,GPIO |