PIC32MX440F256H-80I Datasheet, PDF (531/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
23.5.1 OSCILLATOR SHUTDOWN IN
SLEEP MODE
The criteria for the device disabling the clock source in
SLEEP are: the oscillator type, peripherals using the
clock source, and (for select sources) the clock enable
bit.
• If the CPU clock source is POSC, it is turned off in
SLEEP. See Table 23-2 for applicable delays
when waking from SLEEP. The USB module can
override the disabling of the POSC or FRC. Refer
to the USB section for specific details.
• If the CPU clock source is FRC, it is turned off in
SLEEP. See Table 23-2 for applicable delays
when waking from SLEEP. The USB module can
override the disabling of the POSC or FRC. Refer
to the USB section for specific details.
• If the CPU clock source is SOSC, it will be turned
off if the SOSCEN bit is not set. See Table 23-2
for applicable delays when waking from SLEEP.
• If the CPU clock source is LPRC, it will be turned
off if the clock source is not being used by a
peripheral that will be operating in SLEEP, such
as the WDT. See Table 23-2 for applicable delays
when waking from SLEEP.
23.5.2 CLOCK SELECTION ON WAKE-UP
FROM SLEEP
The processor will resume code execution and use the
same clock source that was active when SLEEP mode
was entered. The device is subject to a start-up delay if
a crystal oscillator and/or PLL is used as a clock source
when the device exits SLEEP.
23.5.3 DELAY ON WAKE-UP FROM SLEEP
The oscillator start-up and Fail-Safe Clock Monitor
delays (if enabled) associated with waking up from
SLEEP mode are shown in Table 23-2.
TABLE 23-2: DELAY TIMES FOR EXIT FROM SLEEP MODE
Clock Source
Oscillator
Delay
EC, EXTRC
—
EC + PLL
XT + PLL
XT, HS, XTL
TLOCK
TOST + TLOCK
TOST
LP (OFF during Sleep)
TOST
LP (ON during Sleep)
—
FRC, LPRC
—
FSCM Delay
—
TFSCM
TFSCM
TFSCM
TFSCM
—
—
Note:
Refer to Section 30.0 “Electrical Char-
acteristics” for TPOR, TFSCM, and TLOCK
specifications.
© 2008 Microchip Technology Inc.
Preliminary
DS61143E-page 529