AT32UC3A4128S Atmel Corporation, AT32UC3A4128S Datasheet - Page 448

• Manufacturer Part Number: AT32UC3A4128S
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A4128S

• Flash (kbytes): 128 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
• 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: AES
• 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
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

22.8.2.2
22.8.2.3
32072G–11/2011
Address Matching
Setting Up and Performing a Transfer
TTOUT: Prescaled clock cycles used to time SMBUS timeout T
SUDAT: Non-prescaled clock cycles for data setup and hold count. Used to time T
EXP: Specifies the clock prescaler setting used for the SMBUS timeouts.
Figure 22-6. Bus Timing Diagram
Operation of the TWIS is mainly controlled by the Control Register (CR). The following list pres-
ents the main steps in a typical communication:
The interrupt system can be set up to generate interrupt request on specific events or error con-
ditions, for example when a byte has been received.
The NBYTES register is only used in SMBus mode, when PEC is enabled. In I²C mode or in
SMBus mode when PEC is disabled, the NBYTES register is not used, and should be written to
zero. NBYTES is updated by hardware, so in order to avoid hazards, software updates of
NBYTES can only be done through writes to the NBYTES register.
The TWIS can be set up to match several different addresses. More than one address match
may be enabled simultaneously, allowing the TWIS to be assigned to several addresses. The
address matching phase is initiated after a START or REPEATED START condition. When the
TWIS receives an address that generates an address match, an ACK is automatically returned
to the master.
4. Before any transfers can be performed, bus timings must be configured by writing to
5. The Control Register (CR) must be configured with information such as the slave
the Timing Register (TR).If the Peripheral DMA Controller is to be used for the trans-
fers, it must be set up.
address, SMBus mode, Packet Error Checking (PEC), number of bytes to transfer, and
which addresses to match.
S
t
t LOW
HD:STA
t
SU:DAT
t HIGH
t
HD:DAT
t LOW
t
t
SU:DAT
SU:STA
Sr
TIMEOUT
.
t
SU:STO
SU_DAT
P
.
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