Manual

63
ATmega161(L)
1228C–AVR–08/02
Serial Peripheral
Interface – SPI
The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer
between the ATmega161 and peripheral devices or between several AVR devices. The
ATmega161 SPI features include the following:
•
Full-duplex, 3-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 (Slave Mode Only)
• Double-speed (CK/2) Master SPI Mode
Figure 40. SPI Block Diagram
SPI2X
SPI2X
DIVIDER
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