11.2.7 Protection Region n Lock Control Register

Table 11-7. Register Bit Attribute Legend
Symbol	Description	Symbol	Description	Symbol	Description
R	Readable bit	HC	Cleared by Hardware	(Gray cell)	Unimplemented
W	Writable bit	HS	Set by Hardware	X	Bit is unknown at Reset
C	Write to clear	S	Software settable bit	x	Channel number


Bit	31	30	29	28	27	26	25	24
	KEY[15:8]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	KEY[7:0]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8

Access
Reset


Bit	7	6	5	4	3	2	1	0
							LOCK[1:0]
Access							R/W	R/W
Reset							0	0

Bits 31:16 – KEY[15:0] Write Key bits

Register is read-only if LOCK[1:0] bits are set to ‘01’. Writes to the PRxLOCK registers must be 32 bits with the 0xB737 key field value; otherwise, the write is ignored. The region descriptors are locked (read-only) on Reset to prevent inadvertent writes from corrupting a descriptor. The region descriptor registers are unlocked (writes enabled) by setting LOCK[1:0] bits to ‘11’.

Bits 1:0 – LOCK[1:0] Protection Region Lock Option bits

Register is read-only if LOCK[1:0] bits are set to ‘01’. Writes to the PRxLOCK registers must be 32 bits with the 0xB737 key field value; otherwise, the write is ignored. The region descriptors are locked (read-only) on Reset to prevent inadvertent writes from corrupting a descriptor. The region descriptor registers are unlocked (writes enabled) by setting LOCK[1:0] bits to ‘11’.

Value	Description
1	Region descriptor is unlocked (can be modified in SFRs)
10	Reserved
01	Region descriptor is locked, cannot be unlocked until after the next reset
00	Region descriptor is locked

Name:	PRnLOCK
Offset:	0x30C, 0x31C, 0x32C, 0x33C, 0x34C, 0x35C, 0x36C, 0x37C