Note that the default firmware on the SAMD09 breakout does not include UART support.

When the UART module is configured, the seesaw can act as an I2C UART bridge.

UART Pins are:

RX: PA11

TX: PA10

The module base register address for the UART is 0x02.

The I2C <-> UART bridge is still in beta at the time of writing this guide. Detailed specs are not yet available.

Function Registers

Status (0x00, 8bits, Read Only)

bits 7-2	bit 1	bit 0
Reserved	DATA_RDY	ERROR

The ERROR bit is set when the UART encounters an error.

The DATA_RDY bit is set when there is data available in the RX buffer. This bit gets cleared when the data is read.

bits 7-1	bit 0
Reserved	DATA_RDY

If the DATA_RDY bit is set, the interrupt will fire when there is data in the RX buffer.

Writing zeros to this register has no effect.

same bits as INTEN. Writing 1 to any bit in this register disabled the corresponding interrupt.

Writing zeros to this register has no effect.

Writing to this register sets the BAUD rate.

Default 9600

Writing to the DATA register puts the data into the TX buffer to be output on the TX pin.

Reading from the DATA register reads the data from the RX buffer.

When this register is read, the DATA_RDY bit is cleared.

This guide was first published on Nov 01, 2017. It was last updated on Sep 05, 2017.

This page (UART) was last updated on Sep 06, 2017.