ANSELA datasheet(93/222 Pages) MICROCHIP

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DS22331A-page 93

MCP19111

15.3

Interrupt Control Registers

15.3.1

INTCON REGISTER

The INTCON register is a readable and writable regis-

ter, that contains the various enable and flag bits for the

TMR0 register overflow, interrupt-on-change and exter-

nal INT pin interrupts.

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, of the INTCON register.

User software should ensure the appropri-

ate interrupt flag bits are clear prior to

enabling an interrupt.

INTCON – INTERRUPT CONTROL REGISTER

R/W-0

R/W-x

GIE

PEIE

T0IE

INTE

IOCE

T0IF

INTF

IOCF

bit 7

bit 0

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

GIE: Global Interrupt Enable bit

= Enables all unmasked interrupts

= Disables all interrupts

bit 6

PEIE: Peripheral Interrupt Enable bit

= Enables all unmasked peripheral interrupts

= Disables all peripheral interrupts

bit 5

T0IE: TMR0 Overflow Interrupt Enable bit

= Enables the TMR0 interrupt

= Disables the TMR0 interrupt

bit 4

INTE: INT External Interrupt Enable bit

= Enables the INT external interrupt

= Disables the INT external interrupt

bit 3

IOCE: Interrupt-on-Change Enable bit(1)

1 = Enables the interrupt-on-change

0 = Disables the interrupt-on-change

bit 2

T0IF: TMR0 Overflow Interrupt Flag bit(2)

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

= TMR0 register did not overflow

bit 1

INTF: External Interrupt Flag bit

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

= The external interrupt did not occur

bit 0

IOCF: Interrupt-on-Change Interrupt Flag bit

= When at least one of the interrupt-on-change pins changed state

= None of the interrupt-on-change pins have changed state

Note 1:

IOC register must also be enabled.

T0IF bit is set when TMR0 rolls over. TMR0 is unchanged on Reset and should be initialized before clear-

ing T0IF bit.

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