6

I/O interfaces

Teseo-LIV3FL supports two I/O interfaces:

•

UART

•

I2C

Both interfaces support the 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 that receives from a peripheral device

on an RX0 pin. They do parallel to serial conversion on data written by a CPU for transmission on a TX0 pin.

The transmit and receive paths are buffered with internal FIFO memories that allow up to 64 bytes of data for

transmission and 64 bytes of 4-bit status data like interrupt, frame, parity, and overrun, for reception.

6.2

I2C

Teseo-LIV3FL 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-LIV3FL receiver always acts as slave. It cannot initiate data transmission on the bus; sometimes the host

has to pull the receiver to check availability of the data.

The main features are:

•

Normal speed (100 kHz) and fast speed (400 kHz) supported

Teseo-LIV3FL

I/O interfaces

DS13881 - Rev 4

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