Datasheet

42
XMEGA A3U [DATASHEET]
Atmel-8386D-AVR-ATxmega64A3U-128A3U-192A3U-256A3U–03/2014
23. SPI – Serial Peripheral Interface
23.1 Features
 Three Identical SPI peripherals
 Full-duplex, three-wire synchronous data transfer
 Master or slave operation
 Lsb first or msb first data transfer
 Eight programmable bit rates
 Interrupt flag at the end of transmission
 Write collision flag to indicate data collision
 Wake up from idle sleep mode
 Double speed master mode
23.2 Overview
The Serial Peripheral Interface (SPI) is a high-speed synchronous data transfer interface using three or four pins. It
allows fast communication between an Atmel AVR XMEGA device and peripheral devices or between several
microcontrollers. The SPI supports full-duplex communication.
A device connected to the bus must act as a master or slave. The master initiates and controls all data transactions.
PORTC, PORTD, and PORTE each has one SPI. Notation of these peripherals are SPIC, SPID, and SPIE respectively.