PIC12F683
2.2.2.5
PIR1 Register
The PIR1 register contains the interrupt flag bits, as
shown in Register 2-5.
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.
REGISTER 2-5:
PIR1 – PERIPHERAL INTERRUPT REQUEST REGISTER 1 (ADDRESS: 0Ch)
R/W-0
EEIF
R/W-0
ADIF
R/W-0
U-0
—
R/W-0
CMIF
R/W-0
OSFIF
R/W-0
R/W-0
CCP1IF
TMR2IF
TMR1IF
bit 7
bit 0
bit 7
bit 6
bit 5
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
ADIF: A/D Interrupt Flag bit
1= A/D conversion complete
0= A/D conversion has not completed or has not been started
CCP1IF: CCP1 Interrupt Flag bit
Capture mode:
1= A TMR1 register capture occurred (must be cleared in software)
0= No TMR1 register capture occurred
Compare mode:
1= A TMR1 register compare match occurred (must be cleared in software)
0= No TMR1 register compare match occurred
PWM mode:
Unused in this mode.
bit 4
bit 3
Unimplemented: Read as ‘0’
CMIF: Comparator Interrupt Flag bit
1= Comparator 1 output has changed (must be cleared in software)
0= Comparator 1 output has not changed
bit 2
bit 1
bit 0
OSFIF: Oscillator Fail Interrupt Flag bit
1= System oscillator failed, clock input has changed to INTOSC (must be cleared in software)
0= System clock operating
TMR2IF: Timer 2 to PR2 Match Interrupt Flag bit
1= Timer 2 to PR2 match occurred (must be cleared in software)
0= Timer 2 to PR2 match has not occurred
TMR1IF: Timer 1 Overflow Interrupt Flag bit
1= Timer 1 register overflowed (must be cleared in software)
0= Timer 1 has not overflowed
Legend:
R = Readable bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
2004 Microchip Technology Inc.
Preliminary
DS41211B-page 15
MICROCHIP [ MICROCHIP ]
