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STR720 数据表(PDF) 174 Page - STMicroelectronics |
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STR720 数据表(HTML) 174 Page - STMicroelectronics |
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174 / 401 page  STR720 - UART 174/401 16.3.5 Baud rate generation The baud rate generator provides a clock at 16 times the baud rate, called the oversampling clock. This clock only ticks if ASCControl(Run) is set to’1’. Setting this bit to 0 will immediately freeze the state of the ASCs transmitter and receiver. This should only be done when the ASC is idle. The baud rate and the required reload value for a given baud rate can be determined by the following formulae: Baudrate = fAPB / (16 * <ASCBaudRate>) <ASCBaudRate> = fAPB / (16 * Baudrate) where: <ASCBaudRate> represents the content of the ASCBaudRate register, taken as unsigned 16-bit integer, and fAPB is the clock frequency of the APB sub-system to which UART block is connected. The following tables list various commonly used baud rates together with the required reload values and the deviation errors for various different APB clock frequencies.. Table 43. Baud rates with fAPB = 16 MHz Baud rate Reload value (exact) Reload value (integer) Reload value (hex) Deviation error 625K 1.6 2 0002 20% 38.4K 26.042 26 001A 0.160% 19.2K 52.083 52 0034 0.160% 9600 104.167 104 0068 0.160% 4800 208.333 208 00D0 0.160% 2400 416.667 417 01A1 0.080% 1200 833.333 833 0341 0.040% 600 1666.667 1667 0683 0.020% 300 3333.333 3333 0D05 0.010% 75 13333.333 13333 3415 0.003% Table 44. Baud rates with fAPB = 20 MHz Baud rate Reload value (exact) Reload value (integer) Reload value (hex) Deviation error 625K2 20002 0% 38.4K 32.552 33 0021 1.358% 19.2K 65.104 65 0041 0.160% 9600 130.208 130 0082 0.160% 4800 260.417 260 0104 0.160% 2400 520.833 521 0209 0.032% 1200 1041.667 1042 0412 0.032% 600 2083.333 2083 0823 0.016% 1 |
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