PIC16F688 Datasheet, PDF (19/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F688
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 R/W-0
R-0
R/W-0 R/W-0 R/W-0
R-0
R/W-0
EEIF
ADIF
RCIF
C2IF
C1IF
OSFIF
TXIF 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 Interrupt Flag bit
1 = A/D conversion complete
0 = A/D conversion has not completed or has not been started
bit 5
RCIF: USART Receive Interrupt Flag bit
1 = The USART receive buffer is full
0 = The USART receive buffer is empty
bit 4
C2IF: Comparator 2 Interrupt Flag bit
1 = Comparator 2 output has changed (must be cleared in software)
0 = Comparator 2 output has not changed
bit 3
C1IF: Comparator 1 Interrupt Flag bit
1 = Comparator 1 output has changed (must be cleared in software)
0 = Comparator 1 output has not changed
bit 2
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
bit 1
TXIF: USART Transmit Interrupt Flag bit
1 = The USART transmit buffer is empty
0 = The USART transmit buffer is full
bit 0
TMR1IF: Timer1 Overflow Interrupt Flag bit
1 = Timer1 register overflowed (must be cleared in software)
0 = Timer1 has not overflowed
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
 2004 Microchip Technology Inc.
Preliminary
DS41203B-page 17