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ATMEGA16 Datasheet(PDF) 162 Page - ATMEL Corporation |
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ATMEGA16 Datasheet(HTML) 162 Page - ATMEL Corporation |
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162 / 315 page  162 ATmega16(L) 2466E–AVR–10/02 Examples of Baud Rate Setting For standard crystal and resonator frequencies, the most commonly used baud rates for asynchronous operation can be generated by using the UBRR settings in Table 68. UBRR values which yield an actual baud rate differing less than 0.5% from the target baud rate, are bold in the table. Higher error ratings are acceptable, but the receiver will have less noise resistance when the error ratings are high, especially for large serial frames (see “Asynchronous Operational Range” on page 152). The error values are cal- culated using the following equation: Error[%] BaudRate Closest Match BaudRate -------------------------------------------------------- 1 – 100% • = Table 68. Examples of UBRR Settings for Commonly Used Oscillator Frequencies Baud Rate (bps) fosc = 1.0000 MHz fosc = 1.8432 MHz fosc = 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 25 0.2% 51 0.2% 47 0.0% 95 0.0% 51 0.2% 103 0.2% 4800 12 0.2% 25 0.2% 23 0.0% 47 0.0% 25 0.2% 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 – –––––– –––0 0.0% Max (1) 62.5 kbps 125 kbps 115.2 kbps 230.4 kbps 125 kbps 250 kbps 1. UBRR = 0, Error = 0.0% |
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