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AT03255: SAM D/R/L/C Serial Peripheral Interface
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ATMEL Mega (AVR) 8515L Microcontroller data sheet
Atmel START User Guide
AVR basics: SPI on the ATMEGA - Part 1 - Machina Speculatrix
Using Serial Peripheral Interface (SPI) Master and Slave with Atmel AVR Microcontroller | ermicroblog
Atmel START User Guide
Serial Peripheral Interface - Wikipedia
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Atmel START User Guide
Software SPI implementation for AVR - Electrical Engineering Stack Exchange
AVR SD Card Initialization Tutorial Part 1
