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Hi
I found a difference here：
In arm_cortex_m33_dgug_100235_0100_01_en page：322
[0] ENABLE Enable. SAU region enable.The possible values of this bit are:0 SAU region is enabled.1 SAU region is disabled.This bit reset to 0 on a Warm reset.
In DDI0553B_k_armv8m page：1687
ENABLE, bit [0]Enable. SAU region enable.The possible values of this bit are:0 SAU region is disabled.1 SAU region is enabled.
Which one is correct?
Sincerely
Harland
Thanks for your reply, I got the answer I wanted.