Microchip Technology AC244045 Data Sheet

PIC16(L)F1825/1829

DS41440C-page 88

 2010-2012 Microchip Technology Inc.

FIGURE 8-3:

INT PIN INTERRUPT TIMING

Q3 Q4

OSC1

CLKOUT

INT pin

INTF

GIE

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 = 3-5 T

. Synchronous latency = 3-4 T

, where T

= instruction cycle time.

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

3: CLKOUT not available in all oscillator modes.
4: For minimum width of INT pulse, refer to AC specifications in

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

(1)

(2)

(3)

(4)

(5)

(1)