PIC16F1459-ESSQTP datasheet(104/418 Pages) MICROCHIP

104 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 104

Preliminary

 2012 Microchip Technology Inc.

9.1.1

WAKE-UP USING INTERRUPTS

When global interrupts are disabled (GIE cleared) and

any interrupt source has both its interrupt enable bit

and interrupt flag bit set, one of the following will occur:

• If the interrupt occurs before the execution of a

SLEEP instruction

- SLEEP instruction will execute as a NOP.

- WDT and WDT prescaler will not be cleared

-TO bit of the STATUS register will not be set

-PD bit of the STATUS register will not be

cleared.

• If the interrupt occurs during or after the execu-

tion of a SLEEP instruction

- SLEEP instruction will be completely exe-

cuted

- Device will immediately wake-up from Sleep

- WDT and WDT prescaler will be cleared

-TO bit of the STATUS register will be set

-PD bit of the STATUS register will be cleared

Even if the flag bits were checked before executing a

SLEEP instruction, it may be possible for flag bits to

become set before the SLEEP instruction completes. To

determine whether a SLEEP instruction executed, test

the PD bit. If the PD bit is set, the SLEEP instruction

was executed as a NOP.

FIGURE 9-1:

WAKE-UP FROM SLEEP THROUGH INTERRUPT

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

CLKIN(1)

CLKOUT(2)

Interrupt flag

GIE bit

(INTCON reg.)

Instruction Flow

Instruction

Fetched

Instruction

Executed

PC + 1

PC + 2

Inst(PC) = Sleep

Inst(PC - 1)

Inst(PC + 1)

Sleep

Processor in

Sleep

Interrupt Latency(4)

Inst(PC + 2)

Inst(PC + 1)

Inst(0004h)

Inst(0005h)

Inst(0004h)

Forced NOP

PC + 2

0004h

0005h

Forced NOP

T1OSC(3)

PC + 2

Note

External clock. High, Medium, Low mode assumed.

CLKOUT is shown here for timing reference.

T1OSC; See Section 29.0 “Electrical Specifications”.

GIE = 1 assumed. In this case after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution will continue in-line.

PIC16F1459-ESSQTP Datasheet(PDF) 104 Page - Microchip Technology

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