ATmega324P datasheet(204/377 Pages) ATMEL

204 / 377 page

204

7674F–AVR–09/09

ATmega164P/324P/644P

Note:

1. See “About Code Examples” on page 8.

18.6.1

Transmitter and Receiver Flags and Interrupts

The RXCn, TXCn, and UDREn flags and corresponding interrupts in USART in MSPIM mode

are identical in function to the normal USART operation. However, the receiver error status flags

(FE, DOR, and PE) are not in use and is always read as zero.

18.6.2

Disabling the Transmitter or Receiver

The disabling of the transmitter or receiver in USART in MSPIM mode is identical in function to

the normal USART operation.

Assembly Code Example

(1)

USART_MSPIM_Transfer:

; Wait for empty transmit buffer

sbis

UCSRnA, UDREn

rjmp

USART_MSPIM_Transfer

; Put data (r16) into buffer, sends the data

out

UDRn,r16

; Wait for data to be received

USART_MSPIM_Wait_RXCn:

sbis

UCSRnA, RXCn

rjmp

USART_MSPIM_Wait_RXCn

; Get and return received data from buffer

r16, UDRn

ret

C Code Example(1)

unsigned char

USART_Receive( void )

{

/* Wait for empty transmit buffer */

while

( !( UCSRnA & (1<<UDREn)) );

/* Put data into buffer, sends the data */

UDRn = data;

/* Wait for data to be received */

while

( !(UCSRnA & (1<<RXCn)) );

/* Get and return received data from buffer */

return

UDRn;

}

ATmega324P Datasheet(PDF) 204 Page - ATMEL Corporation

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