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AT90PWM2 Datasheet(PDF) 209 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 209 Page - ATMEL Corporation |
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209 / 365 page  209 4317K–AVR–03/2013 AT90PWM2/3/2B/3B Table 18-9. Examples of UBRR Settings for Commonly Frequencies Baud Rate (bps) fclk io = 1.0000 MHz fclk io = 1.8432 MHz fclk io = 2.0000 MHz U2X = 0 U2X = 1 U2X = 0 U2X = 1 U2X = 0 U2X = 1 UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error 2400 250.2%510.2% 47 0.0% 950.0%510.2% 103 0.2% 4800 120.2%250.2% 23 0.0% 470.0%250.2% 51 0.2% 9600 6 -7.0% 12 0.2% 11 0.0% 23 0.0% 12 0.2% 25 0.2% 14.4k 3 8.5% 8 -3.5% 7 0.0% 15 0.0% 8 -3.5% 16 2.1% 19.2k 2 8.5% 6 -7.0% 5 0.0% 11 0.0% 6 -7.0% 12 0.2% 28.8k 1 8.5% 3 8.5% 3 0.0% 7 0.0% 3 8.5% 8 -3.5% 38.4k 1 -18.6% 2 8.5% 2 0.0% 5 0.0% 2 8.5% 6 -7.0% 57.6k 0 8.5% 1 8.5% 1 0.0% 3 0.0% 1 8.5% 3 8.5% 76.8k – – 1 -18.6% 1 -25.0% 2 0.0% 1 -18.6% 2 8.5% 115.2k – – 0 8.5% 0 0.0% 1 0.0% 0 8.5% 1 8.5% 230.4k ––– ––– 0 0.0% – ––– 250k ––– ––– ––– ––– 500k ––– ––– ––– ––– 1M ––– ––– ––– ––– Max. (1) 62.5 kbps 125 kbps 115.2 kbps 230.4 Kbps 125 kpbs 250 kbps 1. UBRR = 0, Error = 0.0% Table 18-10. Examples of UBRR Settings for Commonly Frequencies (Continued) Baud Rate (bps) fclk io = 3.6864 MHz fclk io = 4.0000 MHz fclk io = 7.3728 MHz U2X = 0U2X = 1U2X = 0 U2X = 1U2X = 0U2X = 1 UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error 2400 95 0.0% 191 0.0% 103 0.2% 207 0.2% 191 0.0% 383 0.0% 4800 47 0.0% 95 0.0% 51 0.2% 103 0.2% 95 0.0% 191 0.0% 9600 230.0%470.0% 25 0.2% 510.2%470.0% 95 0.0% 14.4k 15 0.0% 31 0.0% 16 2.1% 34 -0.8% 31 0.0% 63 0.0% 19.2k 11 0.0% 23 0.0% 12 0.2% 25 0.2% 23 0.0% 47 0.0% 28.8k 7 0.0% 15 0.0% 8 -3.5% 16 2.1% 15 0.0% 31 0.0% 38.4k 5 0.0% 11 0.0% 6 -7.0% 12 0.2% 11 0.0% 23 0.0% 57.6k 3 0.0% 7 0.0% 3 8.5% 8 -3.5% 7 0.0% 15 0.0% 76.8k 2 0.0% 5 0.0% 2 8.5% 6 -7.0% 5 0.0% 11 0.0% 115.2k 1 0.0% 3 0.0% 1 8.5% 3 8.5% 3 0.0% 7 0.0% 230.4k 0 0.0% 1 0.0% 0 8.5% 1 8.5% 1 0.0% 3 0.0% 250k 0 -7.8% 1 -7.8% 0 0.0% 1 0.0% 1 -7.8% 3 -7.8% |
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