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COP8CCR9IMT7/NOPB Datasheet(PDF) 66 Page - Texas Instruments |
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COP8CCR9IMT7/NOPB Datasheet(HTML) 66 Page - Texas Instruments |
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66 / 111 page ![]() COP8CBR9, COP8CCR9, COP8CDR9 SNOS535I – OCTOBER 2000 – REVISED MARCH 2013 www.ti.com Table 5-17. Prescaler Factors Prescaler Prescaler Select Factor 00000 NO CLOCK 00001 1 00010 1.5 00011 2 00100 2.5 00101 3 00110 3.5 00111 4 01000 4.5 01001 5 01010 5.5 01011 6 01100 6.5 01101 7 01110 7.5 01111 8 10000 8.5 10001 9 10010 9.5 10011 10 10100 10.5 10101 11 10110 11.5 10111 12 11000 12.5 11001 13 11010 13.5 11011 14 11100 14.5 11101 15 11110 15.5 11111 16 As an example, considering Asynchronous Mode and a crystal frequency of 4.608 MHz, the prescaler factor selected is: (4.608 x 2)/1.8432 = 5 The 5 entry is available in Table 5-17. The 1.8432 MHz prescaler output is then used with proper Baud Rate Divisor (Table 5-16) to obtain different baud rates. For a baud rate of 19200 e.g., the entry in Table 5-16 is 5. N − 1 = 5 (N − 1 is the value from Table 5-16) N = 6 (N is the Baud Rate Divisor) Baud Rate = 1.8432 MHz/(16 x 6) = 19200 The divide by 16 is performed because in the asynchronous mode, the input frequency to the USART is 16 times the baud rate. The equation to calculate baud rates is given below. The actual Baud Rate may be found from: BR = (FC x 2)/(16 x N x P) 66 Functional Description Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9 |
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