Rainbow Electronics ATmega64C1 - Manual (Page 159)

159
7647A–AVR–02/08
ATmega32/64/M1/C1
Note: 1. See “Alternate Functions of Port B” on page 67 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 PB2, replace DD_MOSI with DDB2 and DDR_SPI
with DDRB.
MISO Input User Defined
SCK User Defined Input
SS User Defined Input
Table 15-1. SPI Pin Overrides (1)
Pin Direction, Master SPI Direction, Slave SPI