ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 191
ATxmega256A3BU
Manufacturer Part Number
ATxmega256A3BU
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega256A3BU
Flash (kbytes)
256 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
47
Ext Interrupts
49
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
8
Twi (i2c)
2
Uart
6
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
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
16
Eeprom (bytes)
4096
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
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega256A3BU-AU
Manufacturer:
ST
Quantity:
12 000
Company:
Part Number:
ATxmega256A3BU-MH
Manufacturer:
AAT
Quantity:
400
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15.5
15.5.1
8331A–AVR–07/11
Counter Operation
Changing the Period
Figure 15-2. Clock Selection
The Peripheral Clock (clk
in a device). A selection of the prescaler outputs from 1 to 1/2024 is directly available. In addition
the whole range from 1 to 2
The clock selection (CLKSEL) selects one of the clock prescaler outputs or an event channel for
the High Byte Counter (CNTH) and Low Byte Counter (CNTL). By using the Event System, any
event source such as an external clock signal on any I/O pin can be used as clock input.
By default no clock input is selected and the Counters are not running.
The Counters will always count in single slope mode. Each Counter counts down for each clock
cycle until it reaches BOTTOM, and then reloads the Counter with the Period Register value at
the following clok cycle.
Figure 15-3. Counter Operation
As shown in
access has higher priority than count, and reloads and will be immediate.
The Counter period is changed by writing a new TOP value to the Period Register. Since the
Counter is counting down, the Period Register can be written at any time without affecting the
current period as shown in
of odd waveforms.
CNT
clk
PER
CLKSEL
BOTTOM
Figure
MAX
TOP
Prescaler
Common
15-3, the counter can change the counter value while running. The write
{0,1,2,4,8,64,256,1024}
PER
Figure 15-4 on page
15
) is fed into the Common Prescaler (common for all Timer/Counters
time prescalings is available through the Event System.
clk
PER
/
clk
2
{0,...,15}
PER
/
CNT written
192. This prevents wraparound and generation
Event System
event channels
Atmel AVR XMEGA AU
CNT
events
"reload"
191
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