AT32UC3A464 Atmel Corporation, AT32UC3A464 Datasheet - Page 447

• Manufacturer Part Number: AT32UC3A464
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

22.8.2
22.8.2.1
32072G–11/2011
Operation
Bus Timing
Figure 22-4. Transfer Format
The TWIS has two modes of operation:
A master is a device which starts and stops a transfer and generates the TWCK clock. A slave is
assigned an address and responds to requests from the master. These modes are described in
the following chapters.
Figure 22-5. Typical Application Block Diagram
The Timing Register (TR) is used to control the timing of bus signals driven by the TWIS. TR
describes bus timings as a function of cycles of the prescaled CLK_TWIS. The clock prescaling
can be selected through TR.EXP.
TR has the following fields:
TLOWS: Prescaled clock cycles used to time SMBUS timeout T
• Slave transmitter mode
• Slave receiver mode
Rp: Pull up value as given by the I²C Standard
Host with
Interface
TWI
TWD
TWCK
TWD
TWCK
Start
Serial EEPROM
Atmel TWI
Slave 1
Address
R/W
f
Ack
PRESCALED
I²C RTC
Slave 2
Data
=
f
------------------------ -
2
CLK_TWIS
(
EXP
Controller
I²C LCD
Slave 3
+
Ack
1
)
LOW:SEXT
Data
I²C Temp.
Sensor
Slave 4
.
Rp
Ack
Stop
Rp
VDD
447