24.7.6 Interrupt Flag Status and Clear in COUNT32 mode (CTRLA.MODE = 0)

Note: Interrupt flags must be cleared and then read back to confirm the clear before exiting the ISR to avoid double interrupts.
Table 24-9. Register Bit Attribute Legend
SymbolDescriptionSymbolDescriptionSymbolDescription
RReadable bitHCCleared by Hardware(Grey cell)Unimplemented
WWritable bitHSSet by HardwareXBit is unknown at Reset
KWrite to clearSSoftware settable bit
Name: INTFLAG
Offset: 0x0C
Reset: 0x0000
Property: -

Bit 15141312111098 
 OVFTAMPER    CMP1CMP0 
Access R/WR/WR/WR/W 
Reset 0000 
Bit 76543210 
 PER7PER6PER5PER4PER3PER2PER1PER0 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 

Bit 15 – OVF Overflow

This flag is cleared by writing a '1' to the flag.

This flag is set on the next CLK_RTC_CNT cycle after an overflow condition occurs, and an interrupt request will be generated if INTENCLR/SET.OVF is '1'.

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

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

Bit 14 – TAMPER Tamper event

This flag is set after a tamper condition occurs, and an interrupt request will be generated if INTENCLR.TAMPER/INTENSET.TAMPER is '1'. Writing a '0' to this bit has no effect. Writing a '1' to this bit clears the Tamper interrupt flag.

Bits 8, 9 – CMPn Compare n [n = 1..0]

This flag is cleared by writing a '1' to the flag.

This flag is set on the next CLK_RTC_CNT cycle after a match with the compare condition, and an interrupt request will be generated if INTENCLR.CMPn or INTENSET.CMPn is one.

Writing a ‘0’ to this bit has no effect.

Writing a '1' to this bit clears the Compare n Interrupt flag.

ValueDescription
0The Compare n interrupt is disabled
1The Compare n interrupt is enabled.

Bits 0, 1, 2, 3, 4, 5, 6, 7 – PERn Periodic Interval n [n = 7..0]

This flag is cleared by writing a '1' to the flag.

This flag is set on the 0-to-1 transition of prescaler bit [n+2], and an interrupt request will be generated if INTENCLR/SET.PERn is one.

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

Writing a '1' to this bit clears the Periodic Interval n interrupt flag.