ATxmega16A4U Atmel Corporation, ATxmega16A4U Datasheet - Page 130

• Manufacturer Part Number: ATxmega16A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega16A4U

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• 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): 3.3
• Eeprom (bytes): 1024
• 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

11.7.3
8331B–AVR–06/11
STATUS – Watchdog Status Register
The initial values of these bits are set by the watchdog window timeout period (WDWP) fuses,
and are loaded at power-on. In normal mode these bits are not in use.
In order to change these bits, the WCEN bit must be written to one at the same time. These bits
are protected by the configuration change protection mechanism. For a detailed description,
refer to
Table 11-2.
• Bit 1 – WEN: Watchdog Window Mode Enable
This bit enables the watchdog window mode. In order to change this bit, the WCEN bit in
TRL – Window Mode Control Register” on page 129
This bit is protected by the configuration change protection mechanism. For a detailed descrip-
tion, refer to
• Bit 0 – WCEN: Watchdog Window Mode Change Enable
This bit enables the ability to change the configuration of the
Register” on page
at the same time for the changes to take effect. This bit is protected by the configuration change
protection mechanism, but not protected by the WDT lock fuse.
Bit
+0x02
Read/Write
Initial Value
WPER[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
”Configuration Change Protection” on page
”Configuration Change Protection” on page
Watchdog closed window periods
R
7
–
0
129. When writing a new value to this register, this bit must be written to one
R
6
–
0
Group Configuration
R
5
–
0
128CLK
256CLK
512CLK
1KCLK
2KCLK
4KCLK
8KCLK
16CLK
32CLK
64CLK
8CLK
R
4
–
0
ATMEL CONFIDENTIAL
3
–
R
0
12.
Atmel AVR XMEGA AU
must be written to one at the same time.
12.
”WINCTRL – Window Mode Control
2
–
R
0
Typical Closed Window Periods
R
1
–
0
Reserved
Reserved
Reserved
Reserved
Reserved
0.128s
0.256s
0.512s
16ms
32ms
64ms
8ms
1.0s
2.0s
4.0s
8.0s
SYNCBUSY
R
0
0
STATUS
”WINC-
130