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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87591L датащи(PDF) 163 Page - National Semiconductor (TI) |
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PC87591L датащи(HTML) 163 Page - National Semiconductor (TI) |
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163 / 437 page  Embedded Controller Modules (Continued) Revision 1.07 163 www.national.com The baud rate register is programed with a baud rate divisor of 4 (N = baud rate divisor +1). This produces a baud clock of: BR = (5x10 6)/(16x5x6.5) = 9615.385 % error = (9615.385-9600)/9600 = 0.16 Note that the percent error is much lower than would be possible without the non-integer pre-scaler factor. Refer to the table below for more examples. Calculating the Baud Rate in Synchronous Mode The equation for calculating the baud rate is: BR = SYS_CLK/(2xNxP) where: ● BR is the baud rate ● SYS_CLK is the system clock ● N is the value of the baud rate divisor + 1 ● P is the pre-scaler divide factor selected by the value in the PSR register The same procedure is used for determining the values of N and P, as in Asynchronous mode. However, non-integer pre- scale values are not allowed. System Clock Desired Baud Rate N P Actual Baud Rate Percent Error 4 MHz 9600 2 13 9615.385 0.16 5 MHz 9600 5 6.5 9615.385 0.16 10 MHz 19200 5 6.5 19230.769 0.16 20 MHz 19200 5 13 19230.769 0.16 |
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