PIC16F946-ESLASHMLQTP datasheet(233/330 Pages) MICROCHIP

233 / 330 page

DS41250F-page 231

PIC16F913/914/916/917/946

16.3.1

RB0/INT/SEG0 INTERRUPT

External interrupt on RB0/INT/SEG0 pin is edge-trig-

gered; either rising if the INTEDG bit of the OPTION

When a valid edge appears on the RB0/INT/SEG0 pin,

the INTF bit of the INTCON register is set. This inter-

rupt can be disabled by clearing the INTE control bit of

the INTCON register. The INTF bit must be cleared in

software in the Interrupt Service Routine before

re-enabling this interrupt. The RB0/INT/SEG0 interrupt

can wake-up the processor from Sleep if the INTE bit

was set prior to going into Sleep. The status of the GIE

bit decides whether or not the processor branches to

the interrupt vector following wake-up (0004h). See

Section 16.5 “Power-Down Mode (Sleep)” for details

on Sleep and Figure 16-10 for timing of wake-up from

Sleep through RB0/INT/SEG0 interrupt.

16.3.2

TMR0 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.

16.3.3

PORTB INTERRUPT

An input change on PORTB change sets the RBIF bit

of the INTCON register. The interrupt can be

enabled/disabled by setting/clearing the RBIE bit of the

INTCON register. Plus, individual pins can be

configured through the IOCB register.

FIGURE 16-7:

INTERRUPT LOGIC

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 RBIF

interrupt flag may not get set.

TMR1IF

TMR1IE

C1IF

C1IE

TMR0IF

TMR0IE

INTF

INTE

RBIF

RBIE

GIE

PEIE

Wake-up (If in Sleep mode)

Interrupt to CPU

PEIF

EEIE

EEIF

ADIF

ADIE

IOC-RB4

IOCB4

IOC-RB5

IOCB5

IOC-RB6

IOCB6

IOC-RB7

IOCB7

CCP2IF

CCP2IE

OSFIF

OSFIE

C2IF

C2IE

CCP1IF

CCP1IE

SSPIE

SSPIF

RCIF

RCIE

TXIF

TXIE

LCDIF

LCDIE

LVDIF

LVDIE

TMR2IF

TMR2IE

* Only available on the PIC16F914/917.

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