ATmega32U2 datasheet(138/314 Pages) ATMEL

Part #	ATmega32U2

Description	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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138 / 314 page

138

7799B–AVR–07/09

ATmega8U2/16U2/32U2

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

ATmega8U2/16U2/32U2 and peripheral devices or between several AVR devices.

USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 176.

The Power Reduction SPI bit, PRSPI, in “Minimizing Power Consumption” on page 44 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 12-6 on page 77 for SPI pin placement.

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ATmega32U2 Datasheet(PDF) 138 Page - ATMEL Corporation