6

I/O interfaces

Teseo-LIV4F supports the following I/O interfaces:

•

UART port

•

I2C port

NMEA protocol is supported on both UART and I2C ports.

6.1

UART

The universal asynchronous receiver/transmitter (UART) supports much of the functionality of the industry-

standard 16C650 UART.

The UART performs serial-to-parallel conversion on data asynchronously received from a peripheral device on

UART-RX pin, and parallel-to-serial conversion on data written by CPU for transmission on UART-TX pin. The

transmit and receive paths are buffered with internal FIFO memories allowing up to 64 data bytes for

transmission, and 64 data bytes with 4-bit status (break, frame, parity, and overrun) for receive.

6.2

I2C

Teseo-LIV4F includes a slave I2C interface configurable.

Unlike all other interfaces, I2C is not able to communicate in full-duplex mode; it uses only two bidirectional open-

drain lines, Serial Data Line on pin I2C_SDA and Serial Clock Line on pin I2C_SCL, pulled up with resistors.

Teseo-LIV4F receiver always acts as slave and it cannot initiate data transmission on the bus; host must

periodically poll the receiver to check about data availability.

The main features are:

•

Normal speed (100 kHz) and Fast speed (400 kHz) supported.

•

I2C-slave address configurable using the firmware configurator.

Teseo-LIV4F

I/O interfaces

DS13957 - Rev 6

page 10/32