AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 471

• Manufacturer Part Number: AT32UC3L-EK
• Description: KIT EVAL AVR32 UC3 MCU
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT32UC3L-EK

• Contents: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: UC3L
• Kit Contents: Board
• Features: USB / Battery Powered, Board Controller / Bootloader
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Tool Type: Starter Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3L064
• Interface Type: USB, Capacitive Touch
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

21.8
21.8.1
21.8.2
32099F–11/2010
Functional Description
Transfer Format
Operation
The data put on the TWD line must be 8 bits long. Data is transferred MSB first; each byte
must be followed by an acknowledgement. The number of bytes per transfer is unlimited (see
Figure 21-4 on page
Each transfer begins with a START condition and terminates with a STOP condition (see
ure 21-4 on page
Figure 21-3.
Figure 21-4. Transfer Format
The TWIM has two modes of operation:
The master is the device which starts and stops a transfer and generates the TWCK clock.
These modes are described in the following chapters.
• A high-to-low transition on the TWD line while TWCK is high defines the START condition.
• A low-to-high transition on the TWD line while TWCK is high defines a STOP condition.
• Master transmitter mode
• Master receiver mode
TWD
TWCK
START and STOP Conditions
Start
471).
471).
Address
TWCK
TWD
R/W
Start
Ack
Data
Ack
AT32UC3L016/32/64
Data
Stop
Ack
Stop
Fig-
471