ATMEGA329_07 Datasheet, PDF (160/392 Pages) ATMEL Corporation – 8-bit Microcontroller with In-System Programmable Flash

When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is overridden
according to Table 19-1. For more details on automatic port overrides, refer to “Alternate Port
Functions” on page 65.
Table 19-1.
Pin
MOSI
MISO
SCK
SS
SPI Pin Overrides⁽¹⁾
Direction, Master SPI
User Defined
Input
User Defined
User Defined
Direction, Slave SPI
Input
User Defined
Input
Input
Note: 1. See “Alternate Functions of Port B” on page 68 for a detailed description of how to define the
direction of the user defined SPI pins.
160 ATmega329/3290/649/6490
2552J–AVR–08/07