ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 224
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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19.2.2
19.2.3
19.2.4
8331A–AVR–07/11
Clock Domains
Power Domains
Interrupts and Events
The RTC32 is asynchronous, operating from a different clock source, and the counter is inde-
pendent of the main system clock and its derivative clocks, such as the peripheral clock. For
control and count register updates, it will take a number of RTC32 clocks and/or peripheral clock
cycles before an updated register value is available in the register or until a configuration change
has effect on the RTC. This synchronization time is described for each register.
The Peripheral clock must be more than eight times faster than the RTC32 clock (1.024kHz or
1Hz) when any of the Control or the Count register are accessed (read or written), more than 12
times faster when the Count register is written.
For devices where the RTC32 is located in the V
enables the RTC32 to also function with no main V
to automatically switch from the V
voltage level for the device. When the V
switched back to V
The RTC32 can generate both interrupts and events. The RTC32 will give a compare interrupt
request and/or event at the next count after the counter value equals the compare register value.
The RTC32 will give an overflow interrupt request and/or event at the next count after the coun-
ter value equals the period register value. The overflow will also reset the counter value to zero.
Due to the asynchronous clock domains, events will be generated only for every third overflow or
compare match if the period register is zero. If the period register is one, events will be gener-
ated only for every second overflow or compare match. When the period register is equal to or
above two, events will trigger at every overflow or compare match, just as the interrupt request.
CC
.
CC
domain to the V
CC
voltage is restored, the power is automatically
BAT
CC
Atmel AVR XMEGA AU
BAT
power domain, the battery backup feature
available. A dynamic power switch is used
domain if V
CC
falls below the operating
224
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