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ATmega169P Datasheet(PDF) 160 Page - ATMEL Corporation |
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ATmega169P Datasheet(HTML) 160 Page - ATMEL Corporation |
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160 / 393 page  160 8018N–AVR–08/09 ATmega169P When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is overridden according to Table 18-1. For more details on automatic port overrides, refer to ”Alternate Port Functions” on page 71. Note: 1. See ”Alternate Functions of Port B” on page 74 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 18-1. 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 |
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