ATmega325P datasheet(154/364 Pages) ATMEL

Part #	ATmega325P

Description	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	364 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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154 / 364 page

154

8023F–AVR–07/09

ATmega325P/3250P

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

ATmega325P/3250P and peripheral devices or between several AVR devices. A simplified block

diagram of the Serial Peripheral Interface is shown in Figure 17-1.

The PRSPI bit in ”PRR – Power Reduction Register” on page 44 must be written to zero to

enable the SPI module.

Figure 17-1. SPI Block Diagram

(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 13-3 on page 71 for SPI pin placement.

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ATmega325P Datasheet(PDF) 154 Page - ATMEL Corporation