These bits are write protected. Write 5555h in the FWDGT_CTL register before
writing these bits.
If several window values are used by the application, it is mandatory to wait until
WUD bit is reset before changing the window value. However, after updating the
window value it is not necessary to wait until WUD is reset before continuing code
execution except in case of low-power mode entry (before entering low-power
mode, it is necessary to wait until WUD is reset).
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