Micro Sd Card Interface; Debug Serial Port - Waveshare E9 Hardware Manual

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2.15 Micro SD Card Interface

Micro SD Card Interface is on the back side of Camera interface. When inserting please do not be so hard, in case of making
the SD card bend and damage. When there is no program, set the boot mode as SD card boot, then you can burn program to the
board. The SD card can be set as automatic burning, manual burning or UBoot boot card. After the system booted, the Micro
SD card can be used as an external storage device.

2.16 Debug serial port

UART1 white interface is the 3-line RS232 level debug serial port, 3pin 2.00mm pitch. The real pin's position is on the bottom
of the interface. The interface definition is RXD0, TXD0, and GND from the bottom to top.
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