TESEO-LIV3R datasheet(13/30 Pages) STMICROELECTRONICS

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DS12821 Rev 2

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Teseo-LIV3R

I/O interfaces

Teseo-LIV3R supports two I/O interfaces:



UART



I2C

Both these interfaces support NMEA protocol.

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 RX0 pin, and parallel-to-serial conversion on data written by CPU for

transmission on TX0 pin. The transmit and receive paths are buffered with internal FIFO

memories allowing up to 64 data byte for transmission, and 64 data byte with 4-bit status

(break, frame, parity, and overrun) for receive.

6.2

I2C

Teseo-LIV3R includes a slave I2C interface configurable; I2C is a two-wire communication

interface invented by Philips Semiconductor.

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 SDA and Serial Clock Line on pin

SCL, pulled up with resistors.

Teseo-LIV3R receiver always acts as slave and it cannot initiate data transmission on the

bus; host has to periodically pull 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

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