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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 174 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 174 Page - ATMEL Corporation |
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174 / 364 page  174 8023F–AVR–07/09 ATmega325P/3250P bits of the data read from the UDRn will be masked to zero. The USART has to be initialized before the function can be used. Note: 1. See Section “5.” on page 10. The function simply waits for data to be present in the receive buffer by checking the RXCn Flag, before reading the buffer and returning the value. 18.7.2 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 Status 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. Assembly Code Example (1) USART_Receive: ; Wait for data to be received sbis UCSR0A, RXC0 rjmp USART_Receive ; Get and return received data from buffer in r16, UDR0 ret C Code Example(1) unsigned char USART_Receive( void ) { /* Wait for data to be received */ while ( !(UCSR0A & (1<<RXC0)) ) ; /* Get and return received data from buffer */ return UDR0; } |
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