ATMEGA8U2_14 Datasheet, PDF (147/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

ATmega8U2/16U2/32U2
17.5.3
SPDR – SPI Data Register
Bit
7
6
5
4
3
2
1
0
0x2E (0x4E)
MSB
–
–
–
–
–
–
LSB
SPDR
Read/Write
R/W
R
R
R
R
R
R
R/W
Initial Value
X
X
X
X
X
X
X
X
Undefined
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.
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