atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 157

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

15. Serial Peripheral Interface – SPI
15.1
7647A–AVR–02/08
Features
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:
•
•
•
•
•
•
•
•
Figure 15-1. SPI Block Diagram
Note:
The interconnection between Master and Slave CPUs with SPI is shown in
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
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
clk
Figure 1-1 on page
IO
(1)
3, and
Table 9-3 on page 67
ATmega32/64/M1/C1
for SPI pin placement.
Figure
15-2. The sys-
SPIPS
SS_A
MISO
MISO
_A
MOSI
MOSI
_A
SCK
_A
SCK
SS
157