STM8S datasheet(340/467 Pages) STMICROELECTRONICS

340 / 467 page

Universal asynchronous receiver transmitter (UART)

RM0016

340/467

DocID14587 Rev 14

It exits from mute mode when an address character is received which matches the

programmed address. Then the RWU bit is cleared and subsequent bytes are received

normally. The RXNE bit is set for the address character since the RWU bit has been

cleared.

The RWU bit can be written to 0 or 1 when the receiver buffer contains no data (RXNE=0 in

the UART_SR register). Otherwise the write attempt is ignored.

An example of mute mode behavior using address mark detection is given in Figure 121.

Figure 121. Mute mode using Address mark detection

Note:

If parity control is enabled, the parity bit remains in the MSB and the address bit is put in the

"MSB - 1" bit.

For example, with 7-bit data, address mode and parity control:

SB I 7-bit data I ADD I PB I STB

where:

SB = Start Bit

STB = Stop Bit

ADD = Address bit

PB = Parity Bit

22.3.8

LIN (local interconnection network) mode

The UART supports LIN break and delimiter generation in LIN master mode.

Refer to Section 22.4.1: Master mode on page 348 for details. LIN slave mode is supported

by the UART2, UART3 and UART4 only, not by UART1.

LIN mode is selected by setting the LINEN bit in the UART_CR3 register. In LIN mode, the

STM8S Datasheet(PDF) 340 Page - STMicroelectronics