Datasheet

23.5.3 SPDR – SPI Data Register is a read/write register
Name: SPDR
Offset: 0x0F [ID-000004d0]
Reset: 0xXX
Property: When addressing I/O Registers as data space the offset address is 0x2F
When using the I/O specific commands IN and OUT, the I/O addresses 0x00 - 0x3F must be used. When
addressing I/O Registers as data space using LD and ST instructions, 0x20 must be added to these offset
addresses.
Bit 7 6 5 4 3 2 1 0
SPIDn[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset x x x x x x x x
Bits 7:0 – SPIDn[7:0] SPI Data
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 register causes the Shift
Register Receive buffer to be read.
• SPID7 is MSB
• SPID0 is LSB
AVR 8-Bit Microcontroller
SPI – Serial Peripheral Interface
© 2017 Microchip Technology Inc.
Datasheet Complete
40001974A-page 182