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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 181 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 181 Page - ATMEL Corporation |
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181 / 393 page  181 8018N–AVR–08/09 ATmega169P 19.7.2 Receiving Frames with 9 Data Bits If 9-bit characters are used (UCSZ=7) the ninth bit must be read from the RXB8n bit in UCSRnB before reading the low bits from the UDRn. This rule applies to the FEn, DORn and UPEn Sta- tus Flags as well. Read status from UCSRnA, then data from UDRn. Reading the UDRn I/O location will change the state of the receive buffer FIFO and consequently the TXB8n, FEn, DORn and UPEn bits, which all are stored in the FIFO, will change. The following code example shows a simple USART receive function that handles both nine bit characters and the status bits. |
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