AT32UC3L0128 Atmel Corporation, AT32UC3L0128 Datasheet - Page 508
AT32UC3L0128
Manufacturer Part Number
AT32UC3L0128
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(159 pages)
3.AT32UC3L0128.pdf
(85 pages)
4.AT32UC3L0128.pdf
(852 pages)
Specifications of AT32UC3L0128
Flash (kbytes)
128 Kbytes
Pin Count
48
Max. Operating Frequency
50 MHz
Cpu
32-bit AVR
# Of Touch Channels
17
Hardware Qtouch Acquisition
Yes
Max I/o Pins
36
Ext Interrupts
36
Usb Speed
No
Usb Interface
No
Spi
5
Twi (i2c)
2
Uart
4
Lin
4
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
12
Adc Speed (ksps)
460
Analog Comparators
8
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.62 to 3.6
Operating Voltage (vcc)
1.62 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
18
Input Capture Channels
12
Pwm Channels
35
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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- AT32UC3A0128 PDF datasheet
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22.8.2.2
22.8.2.3
32145A–12/2011
Setting Up and Performing a Transfer
Address Matching
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.
3. Before any transfers can be performed, bus timings must be configured by writing to the
4. The Control Register (CR) must be configured with information such as the slave
Timing Register (TR).If the Peripheral DMA Controller is to be used for the transfers, 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
AT32UC3L0128/256
Sr
TIMEOUT
.
t
SU:STO
SU_DAT
P
.
508
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