ATMEGA640 datasheet(232/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

Note:

1. See “About Code Examples” on page 10.

23.5.1

Transmitter and Receiver Flags and Interrupts

The RXCn, TXCn, and UDREn flags and corresponding interrupts in USART in MSPIM mode are identical in func-

tion 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.

23.5.2

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.

23.6 USART MSPIM Register Description

The following section describes the registers used for SPI operation using the USART.

23.6.1

UDRn – USART MSPIM I/O Data Register

The function and bit description of the USART data register (UDRn) in MSPI mode is identical to normal USART

operation. See “UDRn – USART I/O Data Register n” on page 218.

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;

}

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