29.7.15 Security Attribution Check

This register allows the user to select one or more external pins to check their security attribution as non-secured.

Table 29-17. 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:	NSCHK
Offset:	0x3C
Reset:	0x00000000
Property:	PAC Write-Protection


Bit	31	30	29	28	27	26	25	24
	NMI
Access	R/W
Reset	0


Bit	23	22	21	20	19	18	17	16

Access
Reset


Bit	15	14	13	12	11	10	9	8
	EXTINT[15:8]
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	7	6	5	4	3	2	1	0
	EXTINT[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 31 – NMI Non-Maskable Interrupt Security Attribution Check

This bit selects the Non-Maskable Interrupt pin for security attribution check. If the NMI bit in NONSECNMI is set to the opposite value, then the NSCHK interrupt flag will be set.

Value	Description
0	0-to-1 transition will be detected on corresponding NONSEC bit.
1	1-to-0 transition will be detected on corresponding NONSEC bit.

Bits 15:0 – EXTINT[15:0] External Interrupts Security Attribution Check

These bits select the individual pins for security attribution check. If any pin selected in NSCHK has the corresponding bit in NONSEC set to the opposite value, then the NSCHK interrupt flag will be set.

Value	Description
0	0-to-1 transition will be detected on corresponding NONSEC bit.
1	1-to-0 transition will be detected on corresponding NONSEC bit.