ATmega32A datasheet(138/352 Pages) ATMEL

Part #	ATmega32A

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

PDF	352 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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138 / 352 page

138

8155B–AVR–07/09

ATmega32A

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

ATmega32A and peripheral devices or between several AVR devices.

Figure 18-1. SPI Block Diagram

(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 12-6 on page 59 for SPI pin placement.

The interconnection between Master and Slave CPUs with SPI is shown in Figure 18-2. The sys-

tem consists of two Shift Registers, and a Master clock generator. The SPI Master initiates the

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ATmega32A Datasheet(PDF) 138 Page - ATMEL Corporation