AT90PWM2 datasheet(175/365 Pages) ATMEL

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175

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

17. Serial Peripheral Interface – SPI

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

AT90PWM2/2B/3/3B and peripheral devices or between several AVR devices.

The AT90PWM2/2B/3/3B SPI includes the following features:

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

Figure 17-1. SPI Block Diagram

(1)

Note:

1. Refer to Figure 3-1 on page 3, and Table 11-3 on page 69 for SPI pin placement.

The interconnection between Master and Slave CPUs with SPI is shown in Figure 17-2. The sys-

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

communication cycle when pulling low the Slave Select SS pin of the desired Slave. Master and

Slave prepare the data to be sent in their respective shift Registers, and the Master generates

DIVIDER

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

clk

MISO

MOSI

SCK

SS_A

SPIPS

AT90PWM2 Datasheet(PDF) 175 Page - ATMEL Corporation