Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 157)

100

101

157

7647A–AVR–02/08

ATmega32/64/M1/C1

15. Serial Peripheral Interface – SPI

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

ATmega32/64/M1/C1 and peripheral devices or between several AVR devices.

The ATmega32/64/M1/C1 SPI includes the following features:

15.1 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 15-1. SPI Block Diagram

(1)

Note: 1. Refer to Figure 1-1 on page 3, and Table 9-3 on page 67 for SPI pin placement.

The interconnection between Master and Slave CPUs with SPI is shown in Figure 15-2. 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

SPI2X

DIVIDER

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

clk

MISO

MOSI

SCK

SS_A

SPIPS

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 365 366

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Rainbow-electronics ATmega64C1 Manual de usuario Pagina 157

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