STM8S datasheet(348/467 Pages) STMICROELECTRONICS

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Universal asynchronous receiver transmitter (UART)

RM0016

348/467

DocID14587 Rev 14

22.4

LIN mode functional description

In LIN mode, 8-bit data format with 1 stop bit is required in accordance with the LIN

standard.

To configure these settings, clear the M bit in UART_CR1 register and clear the STOP[1:0]

bits in the UART_CR3 register.

22.4.1

Master mode

UART initialization

Procedure:

Select the desired baudrate by programming the UART_BRR2 and UART_BRR1

registers.

Enable LIN mode by setting the LINEN bit in the UART_CR3 register.

Enable the transmitter and receiver by setting the TEN and REN bits in the UART_CR2

LIN header transmission

According to the LIN protocol, any communication on the LIN bus is triggered by the Master

sending a Header, followed by the response. The Header is transmitted by the Master Task

(master node) while the data are transmitted by the Slave task of a node (master node or

one of the slave nodes).

Procedure without error monitoring:

Request Break + Delimiter transmission (13 dominant bits and 1 recessive bit) by

setting the SBK bit in the UART_CR2 register.

Request Synch Field transmission by writing 0x55 in the UART_DR register.

Wait for the TC flag in the UART_SR register.

Request Identifier Field transmission by writing the protected identifier value in the

UART_DR register.

Wait for the TC flag in the UART_SR register.

Procedure with error monitoring:

Request Break + Delimiter transmission (13 dominant bits and 1 recessive bit) by

setting the SBK bit in the UART_CR2 register;

Wait for the LBDF flag in the UART_CR4 register.

Request Synch Field transmission by writing 0x55 into UART_DR register.

Wait for the RXNE flag in the UART_SR register and read back the UART_DR register.

Request Identifier Field transmission by writing the protected identifier value in the

UART_DR register.

Wait for the RXNE flag in the UART_SR register and read back the UART_DR register.

The LBDF flag is set only if a valid Break + Delimiter has been received back on the

UART_RX pin.

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