Hi 朱葛峻,
I think Mark mean the following register, you may refer to http://infocenter.arm.com/help/topic/com.arm.doc.dui0553a/DUI0553A_cortex_m4_dgug.pdf for more details.
Have a great day,
Kan
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Dear 葛峻 朱,
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Wlodek_D.