ATxmega128D4 Atmel Corporation, ATxmega128D4 Datasheet - Page 130
ATxmega128D4
Manufacturer Part Number
ATxmega128D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128D4
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Speed
No
Usb Interface
No
Spi
4
Twi (i2c)
2
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
200
Analog Comparators
2
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
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
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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12.7.2
12.7.3
8210B–AVR–04/10
Frequency Capture
Pulse-width Capture
Selecting the frequency capture event action, makes the enabled capture channel perform a
input capture and restart on any event. This enables Timer/Counter to use capture to measure
the period or frequency of a signal directly. The capture result will be the time, T, from the previ-
ous Timer/Counter restart and until the event occurred. This can be used to calculate the
frequency, f, of the signal:
Figure 12-10 on page 130
nal signal.
Figure 12-10. Frequency capture of an external signal
Since all capture channels uses the same Counter (CNT), only one capture channels must be
enabled at a time. If two capture channels are used with different source, the Counter will be
restarted on positive edge events from both input sources, and the result from the input capture
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 start at zero at every start of a pulse and the input capture will be performed at
the end of the pulse. The event source must be an I/O pin and the sense configuration for the pin
must be set up to generate an event on both edges.
ple where the pulse width is measured twice for an external signal.
f
=
external signal
events
CNT
1
-- -
T
MAX
BOT
shows an example where the Period is measured twice for an exter-
Period (T)
Figure 12-11 on page 131
XMEGA D
shows and exam-
"capture"
130
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