Datasheet

Table 25-3. Comparison of USART in MSPIM Mode and SPI Pins
USART_MSPIM SPI Comments
TxDn MOSI Master Out only
RxDn MISO Master In only
XCKn SCK (Functionally identical)
(N/A) SS Not supported by USART in MSPIM
25.8 Register Description
Refer to the USART register description.
Related Links
24.12 Register Description
ATmega48PA/88PA/168PA
USART in SPI (USARTSPI) Mode
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Datasheet Complete
DS40002011A-page 270