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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) 177 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 177 Page - ATMEL Corporation |
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177 / 448 page  177 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P Figure 19-1. USART Block Diagram (1) Note: 1. Refer to Figure 1-1 on page 2 and Table 13-9 on page 88 for USART0 pin placement. 19.3 Clock Generation The Clock Generation logic generates the base clock for the Transmitter and Receiver. The USART supports four modes of clock operation: Normal asynchronous, Double Speed asyn- chronous, Master synchronous and Slave synchronous mode. The UMSELn bit in USART Control and Status Register C (UCSRnC) selects between asynchronous and synchronous operation. Double Speed (asynchronous mode only) is controlled by the U2Xn found in the UCSRnA Register. When using synchronous mode (UMSELn = 1), the Data Direction Register for the XCKn pin (DDR_XCKn) controls whether the clock source is internal (Master mode) or external (Slave mode). The XCKn pin is only active when using synchronous mode. PARITY GENERATOR UBRRn [H:L] UDRn(Transmit) UCSRnA UCSRnB UCSRnC BAUD RATE GENERATOR TRANSMIT SHIFT REGISTER RECEIVE SHIFT REGISTER RxDn TxDn PIN CONTROL UDRn(Receive) PIN CONTROL XCKn DATA RECOVERY CLOCK RECOVERY PIN CONTROL TX CONTROL RX CONTROL PARITY CHECKER OSC SYNC LOGIC Clock Generator Transmitter Receiver |
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