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Why $55,$AA are used to reset watchdog?

Question asked by Haneul Kang on Nov 30, 2016
Latest reply on Dec 2, 2016 by Radek Sestak

Hello, I am using MC9S12, and realizing watchdog in COP of this chip. In this datasheet of this chip, they must need to put '$55' and '$AA' to some specific register.
I wonder the meaning of '$55' and '$AA'. In ohter words, I wonder why these characters($55,$AA) are used, and what machanism does the watchdog timer reset (by that charaters).