Datasheet
UART
Two UART v2 modules are available with the following features:
7- or 8-bit data words, 1 or 2 stop bits, programmable parity (even, odd, or none).
Programmable baud rates up to 4 Mbps.
32-byte FIFO on Tx and 32 half-word FIFO on Rx supporting auto-baud.
Note: By default, the Mendel operating system configures UART1 for use with the the serial console.
Note: The SoC also includes UART2 and UART4 lines, but these are used by the SoM for Bluetooth, so you
should not remap these with your own device tree.
SPI
Two full-duplex eSPI interfaces are available, with data rates up to 52 Mbit/s and two chip select lines.
Version 1.2 (August 2019)
Table 23. UART pin signals
Name Type Connector Pins Voltage Description
UART1_TXD Output J1311 93 3.3V Transmit channel
UART1_RXD Input J1311 95 3.3V Receive channel
UART3_TXD Output J1311 91 3.3V Transmit chanel
UART3_RXD Input J1311 97 3.3V Receive channel
Table 24. SPI channel 1 pin signals
Name Type Connector Pins Voltage Description
ECSPI1_MISO Input J1312 5 3.3V Master input
ECSPI1_MOSI Output J1312 7 3.3V Master output
ECSPI1_SCLK Output J1312 4 3.3V Serial clock
ECSPI1_SS0 Output J1312 8 3.3V Chip select
ECSPI1_SS1 Output J1310 6 3.3V Chip select
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