32.11.8 Interrupt Flag Status and Clear

Important: Devices where the EIC is configured as Mix-Secure, read and write accesses are allowed only if the external interrupt x (EXTINTx) is set as Non-Secure in the NONSEC register (NONSEC.EXTINTx bit).

Note:

Interrupt flags must be cleared and then read back to confirm the clear before exiting the ISR to avoid double interrupts.

Table 32-11. 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:	INTFLAG
Offset:	0x14
Reset:	0x00000000
Property:	-


Bit	31	30	29	28	27	26	25	24
	NSCHK
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
	EXTINT15	EXTINT14	EXTINT13	EXTINT12	EXTINT11	EXTINT10	EXTINT9	EXTINT8
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
	EXTINT7	EXTINT6	EXTINT5	EXTINT4	EXTINT3	EXTINT2	EXTINT1	EXTINT0
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 – NSCHK Non-secure Check Interrupt

This flag is set when write to either NONSEC and NSCHK register and if the related bit of NSCHK is enabled and the related bit of NONSEC is zero.

For devices without TrustZone support, this location is reserved to EXTINT[31]. This flag is set when EXTINT31 pin

matches the external interrupt sense configuration and will generate an interrupt request if INTENCLR.EXTINT[31] or

INTENSET.EXTINT[31] is '1'.

Writing a '0' to this bit has no effect.

Writing a '1' to this bit clears the flag.

Bits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 – EXTINT External Interrupt

The flag bit x is cleared by writing a '1' to it.

This flag is set when the EIC_EXTINTx pin matches the external interrupt sense configuration and will generate an interrupt request if INTENCLR.EXTINT[x] or INTENSET.EXTINT[x] is '1'.

Writing a '0' to this bit has no effect.

Writing a '1' to this bit clears the External Interrupt x flag.