Rainbow-electronics ATmega3290P_V Instrukcja Użytkownika Pobierz pdf (Strona 154)

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ATmega329/339/649/659

2552H–AVR–11/06

When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is

overridden according to Table 72. For more details on automatic port overrides, refer to

“Alternate Port Functions” on page 65.

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.

The following code examples show how to initialize the SPI as a Master and how to per-

form 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 72. 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

Assembly Code Example

(1)

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 374 375

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