PIC18F8720 datasheet(91/380 Pages) MICROCHIP

91 / 380 page

 2004 Microchip Technology Inc.

DS39609B-page 89

PIC18F6520/8520/6620/8620/6720/8720

9.1

INTCON Registers

The INTCON registers are readable and writable

registers, which contain various enable, priority and

flag bits.

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. User software should ensure

the appropriate interrupt flag bits are clear

prior to enabling an interrupt. This feature

allows for software polling.

R/W-0

R/W-x

GIE/GIEH

PEIE/GIEL

TMR0IE

INT0IE

RBIE

TMR0IF

INT0IF

RBIF

bit 7

bit 0

bit 7

GIE/GIEH: Global Interrupt Enable bit

When IPEN (RCON<7>) = 0:

= Enables all unmasked interrupts

= Disables all interrupts

When IPEN (RCON<7>) = 1:

= Enables all high priority interrupts

= Disables all interrupts

bit 6

PEIE/GIEL: Peripheral Interrupt Enable bit

When IPEN (RCON<7>) = 0:

= Enables all unmasked peripheral interrupts

= Disables all peripheral interrupts

When IPEN (RCON<7>) = 1:

= Enables all low priority peripheral interrupts

= Disables all low priority peripheral interrupts

bit 5

TMR0IE: TMR0 Overflow Interrupt Enable bit

= Enables the TMR0 overflow interrupt

= Disables the TMR0 overflow interrupt

bit 4

INT0IE: INT0 External Interrupt Enable bit

= Enables the INT0 external interrupt

= Disables the INT0 external interrupt

bit 3

RBIE: RB Port Change Interrupt Enable bit

= Enables the RB port change interrupt

= Disables the RB port change interrupt

bit 2

TMR0IF: TMR0 Overflow Interrupt Flag bit

= TMR0 register has overflowed (must be cleared in software)

= TMR0 register did not overflow

bit 1

INT0IF: INT0 External Interrupt Flag bit

= The INT0 external interrupt occurred (must be cleared in software)

= The INT0 external interrupt did not occur

bit 0

RBIF: RB Port Change Interrupt Flag bit

= At least one of the RB7:RB4 pins changed state (must be cleared in software)

= None of the RB7:RB4 pins have changed state

Note:

A mismatch condition will continue to set this bit. Reading PORTB will end the

mismatch condition and allow the bit to be cleared.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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