Does the BW16 have a Hardware UART?
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If you check our official website Ameba ARDUINO – Realtek IoT/Wi-Fi MCU Solutions, you may find out more information about BW16.
For example Ameba ARDUINO: Getting Started with BW16/RTL8720DN – Realtek IoT/Wi-Fi MCU Solutions.
Within this page, you may find out detailed pin map of BW16:
where PB1&PB2 are hardware UART pins provided.