PIC16F84A-10SLASHSS datasheet(48/124 Pages) MICROCHIP

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PIC16F8X

DS30430C-page 48

FIGURE 8-17: INT PIN INTERRUPT TIMING

8.9.1

INT INTERRUPT

External interrupt on RB0/INT pin is edge triggered:

either rising if INTEDG bit (OPTION_REG<6>) is set,

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

appears

the

RB0/INT

pin,

the

INTF

bit

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

clearing control bit INTE (INTCON<4>). Flag bit INTF

must be cleared in software via the interrupt service

routine before re-enabling this interrupt. The INT

interrupt can wake the processor from SLEEP

(Section 8.12) only if the INTE bit was set prior to going

into SLEEP. The status of the GIE bit decides whether

the processor branches to the interrupt vector

following wake-up.

8.9.2

TMR0 INTERRUPT

An overﬂow (FFh

→ 00h) in TMR0 will set ﬂag bit T0IF

(INTCON<2>). The interrupt can be enabled/disabled

by setting/clearing enable bit T0IE (INTCON<5>)

(Section 6.0).

8.9.3

PORT RB INTERRUPT

An input change on PORTB<7:4> sets ﬂag bit RBIF

(INTCON<0>). The interrupt can be enabled/disabled

by setting/clearing enable bit RBIE (INTCON<3>)

(Section 5.2).

OSC1

CLKOUT

INT pin

INTF ﬂag

(INTCON<1>)

GIE bit

(INTCON<7>)

INSTRUCTION FLOW

Instruction

fetched

Instruction

executed

Interrupt Latency

PC+1

0004h

0005h

Inst (0004h)

Inst (0005h)

Dummy Cycle

Inst (PC)

Inst (PC+1)

Inst (PC-1)

Inst (0004h)

Dummy Cycle

Inst (PC)

—

Note 1: INTF ﬂag is sampled here (every Q1).

2: Interrupt latency = 3-4Tcy where Tcy = instruction cycle time.

Latency is the same whether Inst (PC) is a single cycle or a 2-cycle instruction.

3: CLKOUT is available only in RC oscillator mode.

4: For minimum width of INT pulse, refer to AC specs.

5: INTF is enabled to be set anytime during the Q4-Q1 cycles.

Note 1: For a change on the I/O pin to be

recognized, the pulse width must be at

least TCY wide.

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