Datasheet

118
ATmega8A [DATASHEET]
8159E–AVR–02/2013
Note: 1. See “Port B Pins Alternate Functions” on page 56 for a detailed description of how to define the direction of the
user defined SPI pins.
The following code examples show how to initialize the SPI as a Master and how to perform 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.
Table 19-1. SPI Pin Overrides
(1)
Pin Direction, Master SPI Direction, Slave SPI
MOSI User Defined Input
MISO Input User Defined
SCK User Defined Input
SS User Defined Input