ATmega1284P datasheet(161/380 Pages) ATMEL

Part #	ATmega1284P

Description	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

PDF	380 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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161 / 380 page

161

8059D–AVR–11/09

ATmega1284P

16. SPI – Serial Peripheral Interface

16.1

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

16.2

Overview

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

ATmega1284P and peripheral devices or between several AVR devices.

USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 198.

The Power Reduction SPI bit, PRSPI, in ”PRR0 – Power Reduction Register 0” on page 46 on

page 50 must be written to zero to enable SPI module.

Figure 16-1. SPI Block Diagram(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 12-6 on page 80 for SPI pin placement.

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ATmega1284P Datasheet(PDF) 161 Page - ATMEL Corporation