Rainbow-electronics ATmega161L User Manual download pdf (Page 68)

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 76543210

$0F ($2F) MSB LSB SPDR

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

InitialValuexxxxxxxxUndefined

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 158 159

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Rainbow-electronics ATmega161L User Manual Page 68