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ATmega16 Datasheet(PDF) 160 Page - ATMEL Corporation |
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ATmega16 Datasheet(HTML) 160 Page - ATMEL Corporation |
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160 / 357 page  160 2466S–AVR–05/09 ATmega16(L) The recommendations of the maximum receiver baud rate error was made under the assump- tion that the receiver and transmitter equally divides the maximum total error. There are two possible sources for the receivers baud rate error. The receiver’s system clock (XTAL) will always have some minor instability over the supply voltage range and the tempera- ture range. When using a crystal to generate the system clock, this is rarely a problem, but for a resonator the system clock may differ more than 2% depending of the resonators tolerance. The second source for the error is more controllable. The baud rate generator can not always do an exact division of the system frequency to get the baud rate wanted. In this case an UBRR value that gives an acceptable low error can be used if possible. 8 96.00 103.90 +3.90/-4.00 ± 1.5 9 96.39 103.53 +3.53/-3.61 ± 1.5 10 96.70 103.23 +3.23/-3.30 ± 1.0 Table 62. Recommended Maximum Receiver Baud Rate Error for Double Speed Mode (U2X = 1) D # (Data+Parity Bit) R slow (%) R fast (%) Max Total Error (%) Recommended Max Receiver Error (%) |
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