ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 170
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 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 Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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8331A–AVR–07/11
Figure 14-7. Changing the period without buffering.
A counter wraparound can occur in any mode of operation when up-counting without buffering,
as shown in
and if a new TOP value that is lower than current CNT is written to PER, it will wrap before a
compare match happen.
Figure 14-8. Unbuffered dual-slope operation.
When double buffering is used, the buffer can be written at any time and still maintain correct
operation. The period register is always updated on the UPDATE condition, as shown for dual-
slope operation in
Figure 14-9. Changing the period using buffering.
CNT
CNT
CNT
BOTTOM
BOTTOM
MAX
MAX
Figure
BOTTOM
MAX
Figure
14-8. This due to the fact that CNT and PER are continuously compared,
PERBUF that is higher
New TOP written to
New Period written to
PER that is higher
than current CNT
than current CNT
14-9. This prevents wraparound and the generation of odd waveforms.
New TOP written to
PER that is higher
than current CNT
Counter Wraparound
New Period written to
PERBUF that is lower
New TOP written to
than current CNT
PER that is lower
than current CNT
Counter Wraparound
Atmel AVR XMEGA AU
New TOP written to
PER that is lower
than current CNT
New PER is updated
with PERBUF value.
"update"
"write"
"update"
"write"
"update"
"write"
170
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