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ATmega325P 데이터시트(PDF) 174 Page - ATMEL Corporation

부품명 ATmega325P
상세설명  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P 데이터시트(HTML) 174 Page - ATMEL Corporation

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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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