PIC16F7X7 datasheet(50/276 Pages) MICROCHIP

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PIC16F7X7

DS30498C-page 48

 2004 Microchip Technology Inc.

4.7.4

EXITING SLEEP WITH AN

INTERRUPT

Any interrupt, such as WDT or INT0, will cause the part

to leave the Sleep mode.

The SCS bits are unaffected by a SLEEP command and

are the same before and after entering and leaving

Sleep. The clock source used after an exit from Sleep

is determined by the SCS bits.

4.7.4.1

Sequence of Events

If SCS<1:0> = 00:

The device is held in Sleep until the CPU start-up

time-out is complete.

If the primary system clock is configured as an

external oscillator (HS, XT, LP), then the OST will

be active waiting for 1024 clocks of the primary

system clock. While waiting for the OST, the

device will be held in Sleep unless Two-Speed

Start-up is enabled. The OST and CPU start-up

timers run in parallel. Refer to Section 15.17.3

“Two-Speed Clock Start-up Mode” for details

on Two-Speed Start-up.

After both the CPU start-up timer and the

Oscillator Start-up Timer have timed out, the

device will exit Sleep and begin instruction

execution with the primary clock defined by the

FOSC bits.

If SCS<1:0> = 01 or 10:

The device is held in Sleep until the CPU start-up

time-out is complete.

After the CPU start-up timer has timed out, the

device will exit Sleep and begin instruction

execution with the selected oscillator mode.

Note:

If a user changes SCS<1:0> just before

entering Sleep mode, the system clock

used when exiting Sleep mode could be

different than the system clock used when

entering Sleep mode.

As an example, if SCS<1:0> = 01, T1OSC

is the system clock and the following

instructions are executed:

BCF

OSCCON,SCS0

SLEEP

then a clock change event is executed. If

the primary oscillator is XT, LP or HS, the

core will continue to run off T1OSC and

execute the SLEEP command.

When Sleep is exited, the part will resume

operation with the primary oscillator after

the OST has expired.

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