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AT90PWM2 Datasheet(PDF) 208 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 208 Page - ATMEL Corporation |
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208 / 365 page  208 4317K–AVR–03/2013 AT90PWM2/3/2B/3B 18.10.5 USART Baud Rate Registers – UBRRL and UBRRH • Bit 15:12 – Reserved Bits These bits are reserved for future use. For compatibility with future devices, these bit must be written to zero when UBRRH is written. • Bit 11:0 – UBRR11:0: USART Baud Rate Register This is a 12-bit register which contains the USART baud rate. The UBRRH contains the four most significant bits, and the UBRRL contains the eight least significant bits of the USART baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud rate is changed. Writing UBRRL will trigger an immediate update of the baud rate prescaler. 18.11 Examples of Baud Rate Setting For standard crystal, resonator and external oscillator frequencies, the most commonly used baud rates for asynchronous operation can be generated by using the UBRR settings in Table 18-9 up to Table 18-12. 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 201). The error values are calcu- lated using the following equation: Table 18-8. UCPOL Bit Settings UCPOL Transmitted Data Changed (Output of TxDn Pin) Received Data Sampled (Input on RxD Pin) 0 Rising XCK Edge Falling XCK Edge 1 Falling XCK Edge Rising XCK Edge Bit 15 14 13121110 9 8 –––– UBRR[11:8] UBRRH UBRR[7:0] UBRRL 76543210 Read/Write RRRR R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 00000000 00000000 Error[%] 1 BaudRate Closest Match BaudRate -------------------------------------------------------- – 100% = |
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