ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 222

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Disabling the Receiver
Flushing the Receive Buffer
222
ATmega640/1280/1281/2560/2561
In contrast to the Transmitter, disabling of the Receiver will be immediate. Data from
ongoing receptions will therefore be lost. When disabled (i.e., the RXENn is set to zero)
the Receiver will no longer override the normal function of the RxDn port pin. The
Receiver buffer FIFO will be flushed when the Receiver is disabled. Remaining data in
the buffer will be lost
The receiver buffer FIFO will be flushed when the Receiver is disabled, i.e., the buffer
will be emptied of its contents. Unread data will be lost. If the buffer has to be flushed
during normal operation, due to for instance an error condition, read the UDRn I/O loca-
tion until the RXCn Flag is cleared. The following code example shows how to flush the
receive buffer.
Note:
Assembly Code Example
C Code Example
USART_Flush:
void USART_Flush( void )
{
}
sbis UCSRnA, RXCn
ret
in
rjmp USART_Flush
unsigned char dummy;
while ( UCSRnA & (1<<RXCn) ) dummy = UDRn;
1. See “About Code Examples” on page 9.
r16, UDRn
(1)
(1)
2549K–AVR–01/07