atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 68

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

SPI Data Register – SPDR
68
ATmega161(L)
The SPI Data Register is a read/write register used for data transfer between the Regis-
ter File and the SPI Shift Register. Writing to the register initiates data transmission.
Reading the register causes the Shift Register Receive buffer to be read.
Bit
$0F ($2F)
Read/Write
Initial Value
MSB
R/W
7
x
R/W
6
x
R/W
5
x
R/W
4
x
R/W
3
x
R/W
2
x
R/W
1
x
LSB
R/W
0
x
1228D–AVR–02/07
Undefined
SPDR