AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

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)

clk IO

DIVIDER

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

SPIPS

MISO

MISO

_A

MOSI

MOSI

_A

SCK

SCK

_A

SS

SS_A

4317K–AVR–03/2013

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

175

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