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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 181 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 181 Page - ATMEL Corporation |
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181 / 386 page  181 2467S–AVR–07/09 ATmega128 The following code example shows a simple USART receive function based on polling of the Receive Complete (RXC) flag. When using frames with less than eight bits the most significant bits of the data read from the UDR will be masked to zero. The USART has to be initialized before the function can be used. Note: 1. See “About Code Examples” on page 9. The function simply waits for data to be present in the receive buffer by checking the RXC flag, before reading the buffer and returning the value. Assembly Code Example (1) USART_Receive: ; Wait for data to be received sbis UCSRA, RXC rjmp USART_Receive ; Get and return received data from buffer in r16, UDR ret C Code Example(1) unsigned char USART_Receive( void ) { /* Wait for data to be received */ while ( !(UCSRA & (1<<RXC)) ) ; /* Get and return received data from buffer */ return UDR; } |
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