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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega325P 데이터시트(PDF) 186 Page - ATMEL Corporation |
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ATmega325P 데이터시트(HTML) 186 Page - ATMEL Corporation |
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186 / 364 page  186 8023F–AVR–07/09 ATmega325P/3250P 18.10.5 UBRRnL and UBRRnH – USART Baud Rate Registers n • 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 UBRRnH is written. • Bit 11:0 – UBRR11:0: USART Baud Rate Register This is a 12-bit register which contains the USART baud rate. The UBRRnH contains the four most significant bits, and the UBRRnL 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 UBRRnL will trigger an immediate update of the baud rate prescaler. 18.11 Examples of Baud Rate Setting For standard crystal and resonator frequencies, the most commonly used baud rates for asyn- chronous operation can be generated by using the UBRRn settings in Table 18-3. UBRRn 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 resis- tance when the error ratings are high, especially for large serial frames (see ”Asynchronous Operational Range” on page 179). The error values are calculated using the following equation: Figure 18-13. UCPOLn Bit Settings UCPOLn Transmitted Data Changed (Output of TxD Pin) Received Data Sampled (Input on RxD Pin) 0 Rising XCK Edge Falling XCK Edge 1 Falling XCK Edge Rising XCK Edge Bit 15141312 1110 9 8 – – – – UBRRn[11:8] UBRRnH UBRRn[7:0] UBRRnL 76 54 32 10 Read/Write R R R R 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 0 0 0 0 0 0 0 0 00 00 00 00 Error[%] BaudRate Closest Match BaudRate -------------------------------------------------------- 1 – ⎝⎠ ⎛⎞ 100% • = |
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