STM8S datasheet(366/467 Pages) STMICROELECTRONICS

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Universal asynchronous receiver transmitter (UART)

RM0016

366/467

DocID14587 Rev 14

22.7.4

Baud rate register 2 (UART_BRR2)

Address offset: 0x03

Reset value: 0x00

22.7.5

Control register 1 (UART_CR1)

Address offset: 0x04

Reset value: 0x00

654

3210

UART_DIV[15:12]

UART_DIV[3:0]

Bits 7:4 UART_DIV[15:12] MSB of UART_DIV.

These 4 bits define the MSB of the UART Divider (UART_DIV)

Bits 3:0 UART_DIV[3:0]: LSB of UART_DIV.

These 4 bits define the LSB of the UART Divider (UART_DIV)

654

3210

UARTD

WAKE

PCEN

PIEN

Bit 7 R8: Receive Data bit 8.

This bit is used to store the 9th bit of the received word when M=1

Bit 6 T8: Transmit data bit 8.

This bit is used to store the 9th bit of the transmitted word when M=1

Bit 5 UARTD: UART Disable (for low power consumption).

When this bit is set the UART prescaler and outputs are stopped at the end of the current byte

transfer in order to reduce power consumption. This bit is set and cleared by software.

0: UART enabled

1: UART prescaler and outputs disabled

Bit 4 M: word length.

This bit determines the word length. It is set or cleared by software.

0: 1 Start bit, 8 Data bits, n Stop bit (n depending on STOP[1:0] bits in the UART_CR3 register)

1: 1 Start bit, 9 Data bits, 1 Stop bit

Note: The M bit must not be modified during a data transfer (both transmission and reception) In LIN

slave mode, the M bit and the STOP[1:0] bits in the UART_CR3 register should be kept at 0.

Bit 3 WAKE: Wakeup method.

This bit determines the UART wakeup method, it is set or cleared by software.

0: Idle Line

1: Address Mark

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