ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 159
ATxmega128B1
Manufacturer Part Number
ATxmega128B1
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128B1
Flash (kbytes)
128 Kbytes
Pin Count
100
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
53
Ext Interrupts
53
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
3
Twi (i2c)
1
Uart
2
Segment Lcd
160
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
4
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
8
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
10
Input Capture Channels
10
Pwm Channels
10
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128B1-AU
Manufacturer:
TI
Quantity:
90
Company:
Part Number:
ATxmega128B1-U
Manufacturer:
FUJITSU
Quantity:
632
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13.7.3
8291A–AVR–10/11
Pulse Width Capture
timer/counter restart until the event occurred. This can be used to calculate the frequency (f) of
the signal:
Figure 13-12 on page 159
twice.
Figure 13-12. Frequency capture of an external signal.
Since all capture channels use the same counter (CNT), only one capture channel must be
enabled at a time. If two capture channels are used with different sources, the counter will be
restarted on positive edge events from both input sources, and the result will have no meaning.
Selecting the pulse width measure event action makes the enabled compare channel perform
the input capture action on falling edge events and the restart action on rising edge events. The
counter will then restart on positive edge events, and the input capture will be performed on the
negative edge event. The event source must be an I/O pin, and the sense configuration for the
pin must be set to generate an event on both edges.
example where the pulse width is measured twice for an external signal.
f
=
external signal
events
CNT
1
-- -
T
BOTTOM
MAX
shows an example where the period of an external signal is measured
Period (T)
Atmel AVR XMEGA B
Figure 13-13 on page 160
"capture"
shows and
159
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