ATmega328P datasheet(158/345 Pages) ATMEL

Part #	ATmega328P

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

PDF	345 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

Logo

158 / 345 page

158

7810A–AVR–11/09

ATmega328P [Preliminary]

18. SPI – Serial Peripheral Interface

18.1

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

18.2

Overview

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

ATmega328P and peripheral devices or between several AVR devices.

The USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 196. The

PRSPI bit in “Minimizing Power Consumption” on page 40 must be written to zero to enable SPI

module.

Figure 18-1. SPI Block Diagram(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 13-3 on page 74 for SPI pin placement.

DIVIDER

/2/4/8/16/32/64/128

ATmega328P Datasheet(PDF) 158 Page - ATMEL Corporation