ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 159

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

16. SPI – Serial Peripheral Interface
16.1
16.2
8011D–AVR–02/07
Features
Overview
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The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the
ATmega164P/324P/644P and peripheral devices or between several AVR devices.
USART can also be used in Master SPI mode, see “USART in SPI Mode” on page 196.
The Power Reduction SPI bit, PRSPI, in
50 must be written to zero to enable SPI module.
Figure 16-1. SPI Block Diagram
Note:
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
1. Refer to
/2/4/8/16/32/64/128
DIVIDER
Figure 1-1 on page
(1)
2, and
”PRR – Power Reduction Register” on page 48
Table 12-6 on page 81
ATmega164P/324P/644P
for SPI pin placement.
on page
159