What Pin to communicate with MCU and Power supply pin?

Hi,

We have a custom board where we plan to connect a BC66.

Have the following questions:
1 ) Which pins we can use as a uart (Rx-Tx) to connect with external MCU (Custom board) for sending AT commands.

  1. Custom board is able to provide 3.2 volt for BC66 (operating voltage), on which pin we can use for power supply input.

Best Regards

Please refer to the hardware design reference manual I sent you