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Universal asynchronous receiver transmitter (UART)

RM0016

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Universal asynchronous receiver transmitter (UART)

22.1

Introduction

The UARTs in the STM8S and STM8AF microcontroller families (UART1, UART2, UART3

or UART4) offer a flexible means of full-duplex data exchange with external equipment

requiring an industry standard NRZ asynchronous serial data format (UART mode). The

STM8 UARTs offer a very wide range of baud rates and can also be used for multi-

processor communication. They also support LIN (Local Interconnection Network) protocol

version 1.3, 2.0, 2.1, 2.2 and J2602.

UART1, UART2 and UART4 have extended features (see Table 52):

•

LIN slave mode is supported in UART2, UART3 and UART4.

•

Synchronous one-way communication, Smartcard Protocol and IrDA (Infrared Data

Association) SIR ENDEC specifications are supported in UART1, UART2 and UART4.

•

Half-duplex single wire communication is supported in UART1 and UART4.

Refer to the datasheet for information on the availability of the UART configurations

(UART1, UART2, UART3 or UART4) in each microcontroller type.

Table 52. UART configurations(1)

Feature

UART1

UART2

UART3

UART4

Asynchronous mode

XXXX

Multiprocessor communication

XXXX

Synchronous communication

Smartcard mode

IrDA mode

Single-wire Half-duplex mode

LIN master mode

XXXX

LIN slave mode

1. X = supported; NA = not applicable.

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