![](http://datasheet.mmic.net.cn/90000/MC80C32E-12-883-D_datasheet_2371307/MC80C32E-12-883-D_174.png)
174
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
18.5.3
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
7654
3210
MSB
LSB
SPDR
Read/Write
R/W
Initial Value
XXXXXXXX
Undefined