ATmega644PA datasheet(163/468 Pages) ATMEL

Part #	ATmega644PA

Description	8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash

PDF	468 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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163 / 468 page

163

8152G–AVR–11/09

ATmega164PA/324PA/644PA/1284P

17. SPI – Serial Peripheral Interface

17.1

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

17.2

Overview

The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the

ATmega164PA/324PA/644PA/1284P and peripheral devices or between several AVR devices.

USART can also be used in Master SPI mode, see ”USART in SPI Mode” on page 200.

The Power Reduction SPI bit, PRSPI, in ”PRR – Power Reduction Register” on page 49 on page

50 must be written to zero to enable SPI module.

Figure 17-1. SPI Block Diagram(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 13-6 on page 84 for SPI pin placement.

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ATmega644PA Datasheet(PDF) 163 Page - ATMEL Corporation