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STM8S Datasheet(PDF) 336 Page - STMicroelectronics

Part # STM8S
Description  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8S Datasheet(HTML) 336 Page - 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
7
0
7
0
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.
register = 0x02
UART_DIV = 10 000 000/9600
register = 0x41
0x41
0x2
0x0



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