LOCK

Address offset: 0x500

Each bit can only be written once and can only be changed from 0 to 1.


Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																															E	D	C	B	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	LOCKVTORAIRCRS										Locks both the Vector table Offset Register (VTOR) and Application Interrupt and Reset Control Register (AIRCR) for secure mode.
			NotLocked	0								Both VTOR and AIRCR can be changed.
			Locked	1								Prevents changes to both VTOR and AIRCR.
B	RW	LOCKVTORNS										Locks the Vector table Offset Register (VTOR) for non-secure mode.
			NotLocked	0								VTOR can be changed.
			Locked	1								Prevents changes to VTOR.
C	RW	LOCKMPUS										Locks the Memory Protection Unit (MPU) for secure mode.
			NotLocked	0								MPU registers can be changed.
			Locked	1								Prevents changes to MPU registers.
D	RW	LOCKMPUNS										Locks the Memory Protection Unit (MPU) for non secure mode.
			NotLocked	0								MPU registers can be changed.
			Locked	1								Prevents changes to MPU registers.
E	RW	LOCKSAU										Locks the Security Attribution Unit (SAU)
			NotLocked	0								SAU registers can be changed.
			Locked	1								Prevents changes to SAU registers.