AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 646

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 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

27.6.5.3
27.6.6
32145A–12/2011
Filtering
Window Mode Peripheral Events
When operating in window mode, each channel can generate the same peripheral events as in
normal mode, see
Additionally, when channels operate in window mode, programming Window Mode Event Selec-
tion Source (CONFWn.WEVSRC) can cause peripheral events to be generated when:
The output of the comparator can be filtered to reduce noise. The filter length is determined by
the Filter Length field in the CONFn register (CONFn.FLEN). The filter samples the Analog
Comparator output at the GCLK frequency for 2
counts the number of cycles the AC output was one. This filter is deactivated if CONFn.FLEN
equals 0.
If the filter is enabled, the Hysteresis Value field HYS in the CONFn register (CONFn.HYS) can
be used to define a hysteresis value. The hysteresis value should be chosen so that:
The filter function is defined by:
The filtering algorithm is explained in
ber of measurements that are zero is less than (2
number of measurements that are one is more than (2
Otherwise, the result is unchanged.
• As soon as the common input voltage is inside the window.
• As soon as the common input voltage is outside the window.
• On toggle of the window compare output (ACWOUT)
• Whenever a comparison is ready and the common input voltage is inside the window.
• Whenever a comparison is ready and the common input voltage is outside the window.
• When the comparison in both channels in the window pair is ready.
⎛
⎝
Section
2
--------------- -
FLEN
2
+
27.6.4.3.
HYS
CNT
CNT
⎞
⎠
CNT
⎛
⎝
Figure
⎛
⎝
2
--------------- -
2
--------------- - H
FLEN
FLEN
2
2
2
--------------- -
⎛
⎝
FLEN
2
--------------- - H
2
27-3. 2
+
– YS
FLEN
2
HYS
CONFn.FLEN
HYS
– YS
FLEN
⎞
⎠
⎞
⎠
FLEN
⇒
⇒
/2 - HYS), the filtered result is zero. If the
comp
comp
⎞
⎠
FLEN
measurements are sampled. If the num-
⇒
AT32UC3L0128/256
samples. A separate counter (CNT)
/2 + HYS), the filtered result is one.
comp unchanged
=
=
0
1
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