ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 145
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
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ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
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13.6
8331A–AVR–07/11
Port Interrupt
Each port has two interrupt vectors, and it is configurable which pins on the port will trigger each
interrupt. Port interrupts must be enabled before they can be used. Which sense configurations
can be used to generate interrupts is dependent on whether synchronous or asynchronous input
sensing is used.
For synchronous sensing, all sense configurations can be used to generate interrupts. For edge
detection, the changed pin value must be sampled once by the peripheral clock for an interrupt
request to be generated.
For asynchronous sensing, only port pin 2 on each port has full asynchronous sense support.
This means that for edge detection, pin 2 will detect and latch any edge and it will always trigger
an interrupt request. The other port pins have limited asynchronous sense support. This means
that for edge detection, the changed value must be held until the device wakes up and a clock is
present. If the pin value returns to its initial value before the end of the device wake-up time, the
device will still wake up, but no interrupt request will be generated.
A low level can always be detected by all pins, regardless of a peripheral clock being present or
not. If a pin is configured for low-level sensing, the interrupt will trigger as long as the pin is held
low. In active mode, the low level must be held until the completion of the currently executing
instruction for an interrupt to be generated. In all sleep modes, the low level must be kept until
the end of the device wake-up time for an interrupt to be generated. If the low level disappears
before the end of the wake-up time, the device will still wake up, but no interrupt will be
generated.
Table
gered for the various input sense configurations.
Table 13-1.
Table 13-2.
Sense Settings
Rising edge
Falling edge
Both edges
Low level
Sense Settings
Rising edge
Falling edge
Both edges
Low level
13-1,
Table
Synchronous sense support.
Full asynchronous sense support.
13-2, and
Table 13-3 on page 146
Supported
Supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Interrupt Description
Always triggered
Always triggered
Always triggered
Pin level must be kept unchanged during wake up
Interrupt Description
Always triggered
Always triggered
Always triggered
Pin level must be kept unchanged during wake up
Atmel AVR XMEGA AU
summarize when interrupts can be trig-
145
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