33.5.12 PFM Write Protect Region n REGISTER

Table 33-22. Register Bit Attribute Legend
Symbol	Description	Symbol	Description	Symbol	Description
R	Readable bit	HC	Cleared by Hardware	(Grey cell)	Unimplemented
W	Writable bit	HS	Set by Hardware	X	Bit is unknown at Reset
K	Write to clear	S	Software settable bit	—	—

Name:	PWP
Offset:	0x050
Reset:	0x00000000
Property:	R/W


Bit	31	30	29	28	27	26	25	24
					PWPBASE[11:8]
Access					R/W	R/W	R/W	R/W
Reset					0	0	0	0


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


Bit	15	14	13	12	11	10	9	8
	PWPEN	PWPLOCK	PWPMIR		PWPSIZE[11:8]
Access	R/W	R/S	R/W		R/W	R/W	R/W	R/W
Reset	0	0	0		0	0	0	0


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

Bits 27:16 – PWPBASE[11:0] Page Base

The Region Base Address is PWPBASE * 4096.

When PWPEN=1, the region from PWPBASE to PWPBASE+PWPSIZE+1 is write/erase protected.

Note: This is a byte address force to align to page boundaries.

Note: This field can only be modified when PWPLOCK=0, STATUS.BUSY=0 and KEY.KEY=<CFGKEY Value>.

Bit 15 – PWPEN Page Enable

Note: This field can only be modified when PWPLOCK=0, STATUS.BUSY=0 and KEY.KEY=<CFGKEY Value>.

Value	Name	Description
1	ENABLE	PWP is Enabled for the defined region
0	DISABLE	PWP is Not Enabled for the defined region

Bit 14 – PWPLOCK Page Lock

Note: PWPLOCK can be set the same time as PWPBASE and PWPSIZE are written. Once set, PWPLOCK can only be cleared by a reset (Writing zero has no effect.).

Note: This field can only be modified when PWPLOCK=0, STATUS.BUSY=0 and KEY.KEY=<CFGKEY Value>.

Value	Name	Description
1	LOCKED	This register is Locked and cannot be modified
0	UNLOCKED	This register is Not Locked and can be modified

Bit 13 – PWPMIR Page Mirror

Mirrors Lower PFM settings to Upper or Upper PFM settings to Lower. This feature can be used to maintain Write Protect (WP) consistency between Upper and Lower PFM when using PFSWAP.

Note: When Mirrored, the PWPBASE address bit that distinguishes between Upper and Lower PFM is treated as a “Don’t Care”, meaning it can be 0 or 1.

Note: This field can only be modified when PWPLOCK=0, STATUS.BUSY=0 and KEY.KEY=<CFGKEY Value>.

Value	Name	Description
1	MIRROR	PWP settings are Mirrored
0	UNMIRROR	PWP settings are NOT Mirrored

Bits 11:0 – PWPSIZE[11:0] Page Region Size

Pages Region Size is (PWPSIZE+1) *4KB.

0x000= 4KB

0x001= 8KB

...

0x3F= 256KB

Note: This field can only be modified when PWPLOCK=0, STATUS.BUSY=0 and KEY.KEY=<CFGKEY Value>.