Datasheet

260
XMEGA B [DATASHEET]
8291B–AVR–01/2013
Figure 20-2. SPI transfer modes.
20.6 DMA Support
DMA support on the SPI module is available only in slave mode. The SPI slave can trigger a DMA transfer as one byte
has been shifted into the DATA register. It is possible, however, to use the XMEGA USART in SPI mode and then have
DMA support in master mode. For details, refer to “USART in Master SPI Mode” on page 276.
Bit 1
Bit 6
LSB
MSB
Mode 0
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
Mode 2
SS
MSB
LSB
Bit 6
Bit 1
Bit 5
Bit 2
Bit 4
Bit 3
Bit 3
Bit 4
Bit 2
Bit 5
MSB first (DORD = 0)
LSB first (DORD = 1)
Mode 1
SAMPLE I
MOSI/MISO
CHANGE 0
MOSI PIN
CHANGE 0
MISO PIN
Mode 3
SS
MSB
LSB
Bit 6
Bit 1
Bit 5
Bit 2
Bit 4
Bit 3
Bit 3
Bit 4
Bit 2
Bit 5
Bit 1
Bit 6
LSB
MSB
MSB first (DORD = 0)
LSB first (DORD = 1)