ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 201

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2549K–AVR–01/07
When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is
overridden according to Table 96. For more details on automatic port overrides, refer to
“Alternate Port Functions” on page 89.
Table 96. SPI Pin Overrides
Note:
The following code examples show how to initialize the SPI as a Master and how to per-
form a simple transmission. DDR_SPI in the examples must be replaced by the actual
Data Direction Register controlling the SPI pins. DD_MOSI, DD_MISO and DD_SCK
must be replaced by the actual data direction bits for these pins. E.g. if MOSI is placed
on pin PB5, replace DD_MOSI with DDB5 and DDR_SPI with DDRB.
MOSI
MISO
SCK
Pin
SS
1. See “Alternate Functions of Port B” on page 92 for a detailed description of how to
define the direction of the user defined SPI pins.
Direction, Master SPI
User Defined
Input
User Defined
User Defined
ATmega640/1280/1281/2560/2561
(1)
Direction, Slave SPI
Input
User Defined
Input
Input
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