Rainbow-electronics ATmega64M1 Manual de usuario descargar pdf (Pagina 156)

100

101

156

8209A–AVR–08/09

ATmega16M1/32M1/64M1

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 70.

Note: 1. See “Alternate Functions of Port B” on page 72 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.

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

User Defined Input

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 342 343

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