ATxmega64A3U Atmel Corporation, ATxmega64A3U Datasheet - Page 144

• Manufacturer Part Number: ATxmega64A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega64A3U

• Flash (kbytes): 64 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: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• 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): 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

13.5
8331A–AVR–07/11
Input Sense Configuration
Figure 13-8. Synchronization when reading a pin value.
Input sensing is used to detect an edge or level on the I/O pin input. The different sense configu-
rations that are available for each pin are detection of a rising edge, falling edge, or any edge or
detection of a low level. High level can be detected by using the inverted input configuration.
Input sensing can be used to trigger interrupt requests (IREQ) or events when there is a change
on the pin.
The I/O pins support synchronous and asynchronous input sensing. Synchronous sensing
requires the presence of the peripheral clock, while asynchronous sensing does not require any
clock.
Figure 13-9. Input sensing.
SYNCHRONIZER FLIPFLOP
INVERTED I/O
Pn
PERIPHERAL CLK
INSTRUCTIONS
r17
IN
Synchronizer
D
R
Q
INn
D
xxx
R
Q
Asynchronous sensing
Synchronous sensing
DETECT
DETECT
EDGE
EDGE
xxx
0x00
t
pd, max
Atmel AVR XMEGA AU
t
lds r17, PORTx+IN
pd, min
Interrupt
Control
0xFF
IREQ
Event
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