132
8331B–AVR–03/12
Atmel AVR XMEGA AU
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 ”Configuration Change Protection” on page 13.
Note: Reserved settings will not give any timeout for the window.
• Bit 1 – WEN: Window Mode Enable
This bit enables the window mode. In order to change this bit, the WCEN bit in ”WINCTRL –
Window Mode Control register” on page 131 must be written to one at the same time. This bit is
protected by the configuration change protection mechanism. For a detailed description, refer to
”Configuration Change Protection” on page 13.
• Bit 0 – WCEN: Window Mode Change Enable
This bit enables the ability to change the configuration of the ”WINCTRL – Window Mode Control
register” on page 131. When writing a new value to this register, this bit must be written to one 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.
Table 11-2. Watchdog closed window periods
WPER[3:0] Group Configuration Typical Closed Window Periods
0000 8CLK 8ms
0001 16CLK 16ms
0010 32CLK 32ms
0011 64CLK 64ms
0100 128CLK 0.128s
0101 256CLK 0.256s
0110 512CLK 0.512s
0111 1KCLK 1.0s
1000 2KCLK 2.0s
1001 4KCLK 4.0s
1010 8KCLK 8.0s
1011 Reserved
1100 Reserved
1101 Reserved
1110 Reserved
1111 Reserved
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