ATMEGA128-16AU SL383 Atmel, ATMEGA128-16AU SL383 Datasheet - Page 181

• Manufacturer Part Number: ATMEGA128-16AU SL383
• Manufacturer: Atmel

2467S–AVR–07/09
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:
Assembly Code Example
C Code Example
USART_Receive:
unsigned char USART_Receive( void )
{
}
; Wait for data to be received
sbis UCSRA, RXC
rjmp USART_Receive
; Get and return received data from buffer
in
ret
/* Wait for data to be received */
while ( !(UCSRA & (1<<RXC)) )
/* Get and return received data from buffer */
return UDR;
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.
r16, UDR
;
(1)
(1)
ATmega128
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