Rainbow Electronics ATmega161L - Manual (Page 68)

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ATmega161(L)
1228C–AVR–08/02
SPI Data Register – SPDR
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 7 6 5 4 3 2 1 0
$0F ($2F) MSB LSB SPDR
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value x x x x x x x x Undefined