Chengdu Ebyte Electronic Technology Co., Ltd.
4. Connect to MCU
No.
1
The UART module is TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10k pull-up resistor for the TXD & AUX pin.
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Description(STM8L MCU)
E220-400T30S User manual
8