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AT90PWM2 Fiches technique(PDF) 173 Page - ATMEL Corporation

No de pièce AT90PWM2
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  361 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM2 Fiches technique(HTML) 173 Page - ATMEL Corporation

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173
4317J–AVR–08/10
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 68 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
IO
MISO
MISO
_A
MOSI
MOSI
_A
SCK
SCK
_A
SS
SS_A
SPIPS



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