• The USART in MSPIM mode receiver includes an additional buffer level.
• The SPI WCOL (Write Collision) bit is not included in USART in MSPIM mode.
• The SPI double speed mode (SPI2X) bit is not included. However, the same effect is
achieved by setting UBRRn accordingly.
• Interrupt timing is not compatible.
• Pin control differs due to the master only operation of the USART in MSPIM mode.
A comparison of the USART in MSPIM mode and the SPI pins is shown in Table 19-4 on page
216.
Table 19-4. Comparison of USART in MSPIM mode and SPI pins.
USART_MSPIM
TxDn
SPI
MOSI
MISO
SCK
SS
Comment
Master Out only
RxDn
Master In only
XCKn
(Functionally identical)
Not supported by USART in MSPIM
(N/A)
216
AT90USB64/128
7593A–AVR–02/06
ATMEL [ ATMEL ]
