176
4317I–AVR–01/08
AT90PWM2/3/2B/3B
Note:
1. See
“Alternate Functions of Port B” on page 69
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 17-1.
SPI Pin Overrides
(1)
Pin
Direction, Master SPI
Direction, Slave SPI
