Atmel AVR XMEGA D Series, Manual, Page: 99 / 331

99
8210C–AVR–09/11
Atmel AVR XMEGA D
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 11 .
• 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 98 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 11 .
• 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 98 . 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.
9.7.3 STATUS – Status register
• Bit 7:1 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
Table 9-2. 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
Bit 7 6 5 4 3 2 1 0
+0x02 – – – – – – – SYNCBUSY STATUS
Read/Write R R R R R R R R
Initial Value 0 0 0 0 0 0 0 0