###### tags: `Embedded`

# STM32H755ZIT6

## USB

- https://controllerstech.com/usb-cdc-device-and-host-in-stm32/
- https://www.cnblogs.com/xingboy/p/9913963.html
- https://blog.csdn.net/anobodykey/article/details/50636005

## UART

### RS485 Connection/Hardware

check Fail safe bias

> - use strong (a few 100 ohms) pull-up/pull-down resistors to enforce idle state during driver high Z.
> - for short cables (< 5m) and low or medium speed, remove 120 ohm termination resistors at both ends.
>
> https://www.edaboard.com/threads/max3485-with-usb-rs-485.400038/

## References

- https://blog.csdn.net/libofu/article/details/116804145
- AT Commands