ATMEGA640 datasheet(190/436 Pages) MICROCHIP

Part #	ATMEGA640

Description	8-bit Microcontroller with 16/32/64KB In-System Programmable Flash

PDF	436 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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190 / 436 page

190

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

21. SPI – Serial Peripheral Interface

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

ga 6 4 0 / 12 80 /1 28 1/ 25 60 /2 56 1 a n d pe riph er al d e vic e s o r b e twe e n se ver a l AVR d e v i c e s. T h e

ATmega640/1280/1281/2560/2561 SPI includes the following 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

USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 227.

The Power Reduction SPI bit, PRSPI, in “PRR0 – Power Reduction Register 0” on page 55 on page 50 must be

written to zero to enable SPI module.

Figure 21-1. SPI Block Diagram(1)

Note:

1. Refer to Figure 1-1 on page 2, and Table 13-6 on page 76 for SPI pin placement.

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ATMEGA640 Datasheet(PDF) 190 Page - Microchip Technology