PIC16F7X7
2.2.2.5
PIR1 Register
Note: Interrupt flag bits are set when an interrupt
condition occurs regardless of the state of its
corresponding enable bit or the Global Inter-
rupt Enable bit, GIE (INTCON<7>). User
software should ensure the appropriate inter-
rupt bits are clear prior to enabling an interrupt.
The PIR1 register contains the individual flag bits for
the peripheral interrupts.
REGISTER 2-5:
PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1 (ADDRESS 0Ch)
R/W-0
PSPIF(1)
bit 7
R/W-0
ADIF
R-0
R-0
R/W-0
SSPIF
R/W-0
R/W-0
R/W-0
RCIF
TXIF
CCP1IF
TMR2IF
TMR1IF
bit 0
bit 7
PSPIF: Parallel Slave Port Read/Write Interrupt Flag bit(1)
1= A read or a write operation has taken place (must be cleared in software)
0= No read or write has occurred
Note:
PSPIF is reserved on 28-pin devices; always maintain this bit clear.
bit 6
bit 5
bit 4
bit 3
ADIF: A/D Converter Interrupt Flag bit
1= An A/D conversion is completed (must be cleared in software)
0= The A/D conversion is not complete
RCIF: AUSART Receive Interrupt Flag bit
1= The AUSART receive buffer is full
0= The AUSART receive buffer is empty
TXIF: AUSART Transmit Interrupt Flag bit
1= The AUSART transmit buffer is empty
0= The AUSART transmit buffer is full
SSPIF: Synchronous Serial Port (SSP) Interrupt Flag bit
1= The SSP interrupt condition has occurred and must be cleared in software before returning
from the Interrupt Service Routine. The conditions that will set this bit are:
SPI:
A transmission/reception has taken place.
I2C Slave:
A transmission/reception has taken place.
I2C Master:
A transmission/reception has taken place. The initiated Start condition was completed by
the SSP module. The initiated Stop condition was completed by the SSP module. The
initiated Restart condition was completed by the SSP module.The initiated Acknowledge
condition was completed by the SSP module. A Start condition occurred while the SSP
module was Idle (multi-master system). A Stop condition occurred while the SSP module
was Idle (multi-master system).
0= No SSP interrupt condition has occurred
bit 2
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 1
bit 0
TMR2IF: TMR2 to PR2 Match Interrupt Flag bit
1= TMR2 to PR2 match occurred (must be cleared in software)
0= No TMR2 to PR2 match occurred
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
-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.
DS30498C-page 25
MICROCHIP [ MICROCHIP ]
