PIC16F630/676
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 REGISTER 1 (ADDRESS: 0Ch)
R/W-0
EEIF
R/W-0
ADIF
U-0
—
U-0
—
R/W-0
CMIF
U-0
—
U-0
—
R/W-0
TMR1IF
bit 7
bit 0
bit 7
bit 6
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 Converter Interrupt Flag bit (PIC16F676 only)
1= The A/D conversion is complete (must be cleared in software)
0= The A/D conversion is not complete
bit 5-4
bit 3
Unimplemented: Read as ‘0’
CMIF: Comparator Interrupt Flag bit
1= Comparator input has changed (must be cleared in software)
0= Comparator input has not changed
bit 2-1
bit 0
Unimplemented: Read as ‘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
’1’ = Bit is set
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
© 2007 Microchip Technology Inc.
DS40039E-page 15
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