Datasheet

20. SPI – Serial Peripheral Interface
20.1. Features
• Full-duplex, Three-wire Synchronous Data Transfer
• Master or Slave Operation
• LSB First or MSB First Data Transfer
• Seven Programmable Bit Rates
• End of Transmission Interrupt Flag
• Write Collision Flag Protection
• Wake-up from Idle Mode
• Double Speed (CK/2) Master SPI Mode
20.2. Overview
The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the device
and peripheral units, or between several AVR devices.
The USART can also be used in Master SPI mode, please refer to USART in SPI Mode chapter.
To enable the SPI module, Power Reduction Serial Peripheral Interface bit in the Power Reduction
Register (0.PRSPI0) must be written to '0'.
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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