OPTION_REG datasheet(100/222 Pages) MICROCHIP

100 / 222 page

MCP19111

DS22331A-page 100

 2013 Microchip Technology Inc.

16.1.1

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 an 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

execution of a SLEEP instruction:

- SLEEP instruction will be completely

executed

- 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 an NOP.

FIGURE 16-1:

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

OSC

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(1)

Inst(PC + 2)

Inst(PC + 1)

Inst(0004h)

Inst(0005h)

Inst(0004h)

Dummy Cycle

PC + 2

0004h

0005h

Dummy Cycle

TOST

PC + 2

Note 1: GIE = 1 assumed. In this case, after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution

will continue in-line.

TABLE 16-1:

SUMMARY OF REGISTERS ASSOCIATED WITH POWER-DOWN MODE

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Page

INTCON

GIE

PEIE

T0IE

INTE

IOCE

T0IF

INTF

IOCF

IOCA

IOCA7

IOCA6

IOCA5

IOCA4

IOCA3

IOCA2

IOCA1

IOCA0

120

IOCB

IOCB7

IOCB6

IOCB5

IOCB4

—

IOCB2

IOCB1

IOCB0

120

PIE1

—

ADIE

BCLIE

SSPIE

—

TMR2IE

TMR1IE

PIE2

UVIE

—OCIE

OVIE

—

—VINIE

—

PIR1

—

ADIF

BCLIF

SSPIF

—

TMR2IF

TMR1IF

PIR2

UVIF

—OCIF

OVIF

—

VINIF

—

STATUS

IRP

RP1

RP0

ZDC

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used in Power-down mode.

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