atmega103 ATMEL Corporation, atmega103 Datasheet - Page 65

• Manufacturer Part Number: atmega103
• Description: Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

SPI Data Register – SPDR
0945I–AVR–02/07
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
X
7
R/W
X
6
R/W
X
5
R/W
4
X
R/W
3
X
R/W
X
2
ATmega103(L)
R/W
X
1
LSB
R/W
0
X
SPDR
Undefined
65