PIC16F688-ISLASHML datasheet(122/204 Pages) MICROCHIP

122 / 204 page

PIC16F688

DS41203E-page 120

11.3.1

RA2/INT INTERRUPT

External interrupt on RA2/INT pin is edge-triggered;

either rising if the INTEDG bit of the OPTION register is

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

edge appears on the RA2/INT pin, the INTF bit of the

INTCON register is set. This interrupt can be disabled

by clearing the INTE control bit of the INTCON register.

The INTF bit must be cleared in software in the Inter-

rupt Service Routine before re-enabling this interrupt.

The RA2/INT 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 11.6 “Power-Down

Mode (Sleep)” for details on Sleep and Figure 11-10

for timing of wake-up from Sleep through RA2/INT

interrupt.

11.3.2

TIMER0 INTERRUPT

An overflow (FFh

→ 00h) in the TMR0 register will set

the T0IF of the INTCON register bit. 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.

11.3.3

PORTA INTERRUPT

An input change on PORTA change sets the RAIF bit

of the INTCON register. The interrupt can be

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

INTCON

Plus,

individual

pins

can

configured through the IOCA register.

FIGURE 11-7:

INTERRUPT LOGIC

Note:

The ANSEL (91h) and CMCON0 (19h)

registers must be initialized to configure

an analog channel as a digital input. Pins

configured as analog inputs will read ‘0’.

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 RAIF

interrupt flag may not get set.

TMR1IF

TMR1IE

C1IF

C1IE

T0IF

T0IE

INTF

INTE

RAIF

RAIE

GIE

PEIE

Wake-up (If in Sleep mode)

Interrupt to CPU

EEIE

EEIF

ADIF

ADIE

IOC-RA0

IOCA0

IOC-RA1

IOCA1

IOC-RA2

IOCA2

IOC-RA3

IOCA3

IOC-RA4

IOCA4

IOC-RA5

IOCA5

TXIF

TXIE

RCIF

RCIE

OSFIF

OSFIE

C2IF

C2IE

PIC16F688-I/ML Datasheet(PDF) 122 Page - Microchip Technology

PIC16F688-I/ML Datasheet(HTML) 122 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL