PIC1F628 datasheet(104/170 Pages) MICROCHIP

104 / 170 page

PIC16F62X

DS40300C-page 102

Preliminary

 2003 Microchip Technology Inc.

14.6.1

RB0/INT INTERRUPT

External interrupt on RB0/INT pin is edge triggered:

either rising if INTEDG bit (OPTION<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 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

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. See

Section 14.9 for details on SLEEP, and Figure 14-17

for timing of wake-up from SLEEP through RB0/INT

interrupt.

14.6.2

TMR0 INTERRUPT

An overflow (FFh

→ 00h) in the TMR0 register will

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

enabled/disabled

setting/clearing

T0IE

(INTCON<5>) bit. For operation of the Timer0 module,

see Section 6.0.

14.6.3

PORTB INTERRUPT

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

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

disabled by setting/clearing the RBIE (INTCON<4>)

bit. For operation of PORTB (Section 5.2).

14.6.4

COMPARATOR INTERRUPT

See Section 9.6 for complete description of comparator

interrupts.

FIGURE 14-15:

INT PIN INTERRUPT TIMING

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 inter-

rupt flag may not get set.

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: Asynchronous interrupt latency = 3-4 Tcy. Synchronous latency = 3 Tcy, 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 in ER and INTRC 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.

(1)

(4)

(5)

(2)

(3)

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