ST72361AR4-Auto datasheet(194/279 Pages) STMICROELECTRONICS

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LINSCI serial communication interface (LIN master only)

ST72361xx-Auto

194/279

Doc ID 12468 Rev 3

16.3

General description

The interface is externally connected to another device by three pins (see Figure 88: SCI

block diagram). Any SCI bidirectional communication requires a minimum of two pins:

Receive Data In (RDI) and Transmit Data Out (TDO):

●

SCLK: Transmitter Clock Output. This pin outputs the transmitter data clock for

synchronous transmission (no clock pulses on start bit and stop bit, and a software

option to send a clock pulse on the last data bit). This can be used to control

peripherals that have shift registers (e.g. LCD drivers). The clock phase and polarity

are software programmable.

●

TDO: Transmit Data Output. When the transmitter is disabled, the output pin returns to

its I/O port configuration. When the transmitter is enabled and nothing is to be

transmitted, the TDO pin is at high level.

●

RDI: Receive Data Input is the serial data input. Oversampling techniques are used for

data recovery by discriminating between valid incoming data and noise.

Through these pins, serial data is transmitted and received as frames comprising:

●

An idle line prior to transmission or reception

●

A start bit

●

A data word (8 or 9 bits) least significant bit first

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A stop bit indicating that the frame is complete.

This interface uses two types of baud rate generator:

●

A conventional type for commonly-used baud rates,

●

An extended type with a prescaler offering a very wide range of baud rates even with

non-standard oscillator frequencies.

ST72361AR4-Auto Datasheet(PDF) 194 Page - STMicroelectronics