ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 89

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• 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: 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): 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

Atmel AVR XMEGA AU
• Issue a non-maskable interrupt (NMI)
If the PLL or external clock source fails when not being used for the system clock, it is automati-
cally disabled, and the system clock will continue to operate normally. No NMI is issued. The
failure monitor is meant for external clock sources above 32kHz. It cannot be used for slower
external clocks.
When the failure monitor is enabled, it will not be disabled until the next reset.
The failure monitor is stopped in all sleep modes where the PLL or external clock source are
stopped. During wake up from sleep, it is automatically restarted.
The PLL and external clock source failure monitor settings are protected by the configuration
change protection mechanism, employing a timed write procedure for changing the settings. For
details, refer to
”Configuration Change Protection” on page
12.
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