Datasheet

147
7799D–AVR–11/10
ATmega8U2/16U2/32U2
17.5.3 SPDR – SPI Data Register
The SPI Data Register is a read/write register used for data transfer between the Register File
and the SPI Shift Register. Writing to the register initiates data transmission. Reading the regis-
ter causes the Shift Register Receive buffer to be read.
Bit 76543210
0x2E (0x4E) MSB––––––LSBSPDR
Read/Write R/W RRRRRRR/W
Initial Value XXXXXXXXUndefined