#define WDT_WINDOWED_STORE_RSTFR_FLAG 0b10010110uThis is a macro determining if the RSTFR register should be backed up. The flag value chosen is arbritrary, but simply using 0x1 would make it harder to verify that the variable storing the flag is not corrupted. It is backed up when test is run for the first time after a reset which is not caused by this test. This is done because the test itself will affect the contents of the RSTFR.