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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 199 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 199 Page - ATMEL Corporation |
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199 / 448 page  199 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P 19.10.5 UBRRnL and UBRRnH – USART Baud Rate Registers • 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. 19.11 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 19-9. 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 192). The error values are calculated using the following equation: Table 19-8. UCPOLn Bit Settings UCPOLn Transmitted Data Changed (Output of TxDn Pin) Received Data Sampled (Input on RxDn Pin) 0 Rising XCKn Edge Falling XCKn Edge 1 Falling XCKn Edge Rising XCKn Edge Bit 151413121110 9 8 – – – – UBRRn[11:8] UBRRnH UBRRn[7:0] UBRRnL 7 654 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 0 000 00 00 Error[%] BaudRate Closest Match BaudRate -------------------------------------------------- 1 – ⎝⎠ ⎛⎞ 100% • = |
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