STM8S datasheet(336/467 Pages) STMICROELECTRONICS

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Universal asynchronous receiver transmitter (UART)

RM0016

336/467

DocID14587 Rev 14

22.3.4

High precision baud rate generator

The receiver and transmitter (Rx and Tx) are both set to the same baud rate programmed by

a 16-bit divider UART_DIV according to the following formula:

The UART_DIV baud rate divider is an unsigned integer, coded in the BRR1 and BRR2

registers as shown in Figure 119.

Refer to Table 54. for typical baud rate programming examples.

Figure 119. How to code UART_DIV in the BRR registers

Note:

The Baud Counters will be updated with the new value of the Baud Registers after a write to

BRR1. Hence the Baud Register value should not be changed during a transaction. The

BRR2 should be programmed before BRR1.

Note:

UART_DIV must be greater than or equal to 16d.

Tx/ Rx baud rate =

fMASTER

UART_DIV

UART_BRR1

UART_BRR2

4 3

Example: To obtain 9600 baud with fMASTER = 10 MHz.

UART_DIV[15:12]

UART_DIV[11:4]

UART_DIV[3:0]

UART_DIV = 1042d = 0x0412

See Table 54.

UART_DIV = 10 000 000/9600

0x41

0x2

0x0

STM8S bảng dữ liệu(PDF) 336 Page - STMicroelectronics