14.5.2 H2PB Write Protect Control Register

Table 14-3. 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:	WPCTRL
Offset:	0x4
Reset:	0x00000000
Property:	R/W


Bit	31	30	29	28	27	26	25	24
	WPKEY[23:16]
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
	WPKEY[15:8]
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
	WPKEY[7:0]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
							WPLCK	WPEN
Access							R/W	R/W
Reset							0	0

Bits 31:8 – WPKEY[23:0] Write protect command key. The desired value of WPKEY[23:0] is given by the parameter H2PB_WPCTRL_KEY. Writing a value other than H2PB_WPCTRL_KEY to this bit-field cancels the write operation to this register and generates a slave bus error. This bit-field always returns 0 on read.

Bit 1 – WPLCK 1 = WPCTRL register is write-protected (i.e. read-only) for non-debugger accesses. Non-debugger writes to this register are canceled and generate a slave bus error. This bit can only be cleared by a system hardware reset. 0 = WPCTRL register is not write protected. Once set, this bit will make WPCTRL write-protected (i.e. read-only), all the way until the next system hardware reset.

Bit 0 – WPEN Once set, this bit will make write-protected (i.e. read-only) all the SFRs in this macro which are marked by the property "Write-Protected" (like CTRLA, for example). WPCTRL itself is NOT affected by this bit because otherwise WPLCK would be totally redundant.

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