PIC12F629/675
2.2.2.3
INTCON Register
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 soft-
ware should ensure the appropriate
interrupt flag bits are clear prior to enabling
an interrupt.
The INTCON register is a readable and writable
register, which contains the various enable and flag bits
for TMR0 register overflow, GPIO port change and
external GP2/INT pin interrupts.
REGISTER 2-3:
INTCON — INTERRUPT CONTROL REGISTER (ADDRESS: 0Bh OR 8Bh)
R/W-0
GIE
R/W-0
PEIE
R/W-0
T0IE
R/W-0
INTE
R/W-0
GPIE
R/W-0
T0IF
R/W-0
INTF
R/W-0
GPIF
bit 7
bit 0
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit ±
bit 0
GIE: Global Interrupt Enable bit
1= Enables all unmasked interrupts
0= Disables all interrupts
PEIE: Peripheral Interrupt Enable bit
1= Enables all unmasked peripheral interrupts
0= Disables all peripheral interrupts
T0IE: TMR0 Overflow Interrupt Enable bit
1= Enables the TMR0 interrupt
0= Disables the TMR0 interrupt
INTE: GP2/INT External Interrupt Enable bit
1= Enables the GP2/INT external interrupt
0= Disables the GP2/INT external interrupt
(1)
GPIE: Port Change Interrupt Enable bit
1= Enables the GPIO port change interrupt
0= Disables the GPIO port change interrupt
(2)
T0IF: TMR0 Overflow Interrupt Flag bit
1= TMR0 register has overflowed (must be cleared in software)
0= TMR0 register did not overflow
INTF: GP2/INT External Interrupt Flag bit
1= The GP2/INT external interrupt occurred (must be cleared in software)
0= The GP2/INT external interrupt did not occur
GPIF: Port Change Interrupt Flag bit
1= When at least one of the GP5:GP0 pins changed state (must be cleared in software)
0= None of the GP5:GP0 pins have changed state
Note 1: IOC register must also be enabled to enable an interrupt-on-change.
2: T0IF bit is set when TIMER0 rolls over. TIMER0 is unchanged on RESET and
should be initialized before clearing T0IF bit.
Legend:
R = Readable bit
W = Writable bit
’±’ = Bit is set
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
2003 Microchip Technology Inc.
DS41190C-page 13
MICROCHIP [ MICROCHIP ]
