PIC16F913 datasheet(198/272 Pages) MICROCHIP

198 / 272 page

PIC16F917/916/914/913

DS41250E-page 196

Preliminary

16.4.1

RB0/INT/SEG0 INTERRUPT

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

gered; either rising if the INTEDG bit (OPTION<6>) is

set, or falling, if the INTEDG bit is clear. When a valid

edge appears on the RB0/INT/SEG0 pin, the INTF bit

(INTCON<1>) is set. This interrupt can be disabled by

clearing the INTE control bit (INTCON<4>). 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 16.7 “Power-Down

Mode (Sleep)” for details on Sleep and Figure 16-10

for

timing

wake-up

from

Sleep

through

RB0/INT/SEG0 interrupt.

16.4.2

TMR0 INTERRUPT

An overflow (FFh

→ 00h) in the TMR0 register will set

the T0IF (INTCON<2>) bit. The interrupt can be

enabled/disabled

setting/clearing

T0IE

(INTCON<5>) bit. See Section 5.0 “Timer0 Module”

for operation of the Timer0 module.

16.4.3

PORTB INTERRUPT

An input change on PORTB change sets the RBIF

(INTCON<0>)

bit.

The

interrupt

can

enabled/disabled

setting/clearing

the

RBIE

(INTCON<3>) bit. Plus, individual pins can be config-

ured 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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