PIC12F635/PIC16F636/639
12.9.2
TIMER INTERRUPT
12.9.3
PORTA INTERRUPT
An overflow (FFh → 00h) in the TMR0 register will set
the T0IF bit of the INTCON register. The interrupt can be
enabled/disabled by setting/clearing T0IE bit of the
INTCON register. See Section 5.0 “Timer0 Module”
for operation of the Timer0 module.
An input change on PORTA change sets the RAIF bit of
the INTCON register. The interrupt can be
enabled/disabled by setting/clearing the RAIE bit of the
INTCON register. Plus, individual pins can be configured
through the IOCA register.
Note:
If a change on the I/O pin should occur
when the read operation is being executed
(start of the Q2 cycle), then the RAIF
interrupt flag may not get set.
FIGURE 12-7:
INTERRUPT LOGIC
IOC-RA0
IOCA0
IOC-RA1
IOCA1
IOC-RA2
IOCA2
IOC-RA3
IOCA3
IOC-RA4
IOCA4
IOC-RA5
IOCA5
Wake-up (If in Sleep mode)
Interrupt to CPU
T0IF
T0IE
LVDIF
LVDIE
INTF
INTE
RAIF
TMR1IF
TMR1IE
RAIE
C1IF
C1IE
PEIE
GIE
(1)
C2IF
(1)
C2IE
EEIF
EEIE
OSFIF
OSFIE
CRIF
CRIE
Note 1: PIC16F636/639 only.
DS41232D-page 140
© 2007 Microchip Technology Inc.
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