PIC18F45K80-I Datasheet, PDF (168/622 Pages) Microchip Technology – 28/40/44/64-Pin, Enhanced Flash Microcontrollers with ECAN and nanoWatt XLP Technology

PIC18F66K80 FAMILY
10.6 INTx Pin Interrupts
External interrupts on the RB0/INT0, RB1/INT1,
RB2/INT2 and RB3/INT3 pins are edge-triggered. If the
corresponding INTEDGx bit in the INTCON2 register is
set (= 1), the interrupt is triggered by a rising edge. If
that bit is clear, the trigger is on the falling edge.
When a valid edge appears on the RBx/INTx pin, the
corresponding flag bit, INTxIF, is set. This interrupt can
be disabled by clearing the corresponding enable bit,
INTxIE. Before re-enabling the interrupt, the flag bit
(INTxIF) must be cleared in software in the Interrupt
Service Routine.
All external interrupts (INT0, INT1, INT2 and INT3) can
wake up the processor from the power-managed
modes, if bit, INTxIE, was set prior to going into the
power-managed modes. If the Global Interrupt Enable
bit (GIE) is set, the processor will branch to the interrupt
vector following wake-up.
The interrupt priority for INT1, INT2 and INT3 is
determined by the value contained in the Interrupt
Priority bits, INT1IP (INTCON3<6>), INT2IP
(INTCON3<7>) and INT3IP (INTCON2<1>).
There is no priority bit associated with INT0; it is always
a high-priority interrupt source.
10.7 TMR0 Interrupt
In 8-bit mode (the default), an overflow in the TMR0
register (FFh  00h) will set flag bit, TMR0IF. In 16-bit
mode, an overflow in the TMR0H:TMR0L register pair
(FFFFh  0000h) will set TMR0IF.
The interrupt can be enabled/disabled by setting/clearing
enable bit, TMR0IE (INTCON<5>). Interrupt priority for
Timer0 is determined by the value contained in the inter-
rupt priority bit, TMR0IP (INTCON2<2>). For further
details on the Timer0 module, see Section 13.0 “Timer0
Module”.
10.8 PORTB Interrupt-on-Change
An input change on PORTB<7:4> sets flag bit, RBIF
(INTCON<0>). The interrupt can be enabled/disabled
by setting/clearing enable bit, RBIE (INTCON<3>), and
each individual pin can be enabled/disabled by its
corresponding bit in the IOCB register.
Interrupt priority for PORTB interrupt-on-change is
determined by the value contained in the interrupt
priority bit, RBIP (INTCON2<0>).
REGISTER 10-20: IOCB: INTERRUPT-ON-CHANGE PORTB CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
IOCB7⁽¹⁾
IOCB6⁽¹⁾
IOCB5⁽¹⁾
IOCB4⁽¹⁾
—
—
—
bit 7
U-0
—
bit 0
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
bit 7-4
bit 3-0
IOCB<7:4>: Interrupt-on-Change PORTB Control bits⁽¹⁾
1 = Interrupt-on-change is enabled
0 = Interrupt-on-change is disabled
Unimplemented: Read as ‘0’
Note 1: Interrupt-on-change also requires that the RBIE bit of the INTCON register be set.
DS39977F-page 168
 2010-2012 Microchip Technology Inc.