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© 2007 Microchip Technology Inc. DS41190E-page 15
PIC12F629/675
2.2.2.5 PIR1 Register
The PIR1 register contains the interrupt flag bits, as
shown in Register 2-5.
REGISTER 2-5: PIR1 — PERIPHERAL INTERRUPT REGISTER 1 (ADDRESS: 0Ch)
Note: Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the global
enable bit, GIE (INTCON<7>). User
software should ensure the appropriate
interrupt flag bits are clear prior to enabling
an interrupt.
R/W-0 R/W-0 U-0 U-0 R/W-0 U-0 U-0 R/W-0
EEIF ADIF — — CMIF — — TMR1IF
bit 7 bit 0
bit 7 EEIF: EEPROM Write Operation Interrupt Flag bit
1 = The write operation completed (must be cleared in software)
0 = The write operation has not completed or has not been started
bit 6 ADIF: A/D Converter Interrupt Flag bit (PIC12F675 only)
1 = The A/D conversion is complete (must be cleared in software)
0 = The A/D conversion is not complete
bit 5-4 Unimplemented: Read as ‘0’
bit 3 CMIF: Comparator Interrupt Flag bit
1 = Comparator input has changed (must be cleared in software)
0 = Comparator input has not changed
bit 2-1 Unimplemented: Read as ‘0’
bit 0 TMR1IF: TMR1 Overflow Interrupt Flag bit
1 = TMR1 register overflowed (must be cleared in software)
0 = TMR1 register did not overflow
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
- n = Value at POR ’1’ = Bit is set ’0’ = Bit is cleared x = Bit is unknown
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