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PIC18F2525 Datasheet(PDF) 42 Page - Microchip Technology

Part # PIC18F2525
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F2525 Datasheet(HTML) 42 Page - Microchip Technology

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PIC18F2525/2620/4525/4620
DS39626E-page 40
© 2008 Microchip Technology Inc.
3.5.4
EXIT WITHOUT AN OSCILLATOR
START-UP DELAY
Certain exits from power-managed modes do not
invoke the OST at all. There are two cases:
• PRI_IDLE mode, where the primary clock source
is not stopped; and
• the primary clock source is not any of the LP, XT,
HS or HSPLL modes.
In these instances, the primary clock source either
does not require an oscillator start-up delay since it is
already running (PRI_IDLE), or normally does not
require an oscillator start-up delay (RC, EC and INTIO
Oscillator modes). However, a fixed delay of interval
TCSD following the wake event is still required when
leaving Sleep and Idle modes to allow the CPU to
prepare for execution. Instruction execution resumes
on the first clock cycle following this delay.
TABLE 3-2:
EXIT DELAY ON WAKE-UP BY RESET FROM SLEEP MODE OR ANY IDLE MODE
(BY CLOCK SOURCES)
Clock Source
Before Wake-up
Clock Source
After Wake-up
Exit Delay
Clock Ready Status
Bit (OSCCON)
Primary Device Clock
(PRI_IDLE mode)
LP, XT, HS
TCSD(1)
OSTS
HSPLL
EC, RC
INTOSC(2)
IOFS
T1OSC
LP, XT, HS
TOST(3)
OSTS
HSPLL
TOST + trc
(3)
EC, RC
TCSD(1)
INTOSC(2)
TIOBST(4)
IOFS
INTOSC(3)
LP, XT, HS
TOST(3)
OSTS
HSPLL
TOST + trc
(3)
EC, RC
TCSD(1)
INTOSC(2)
None
IOFS
None
(Sleep mode)
LP, XT, HS
TOST(3)
OSTS
HSPLL
TOST + trc
(3)
EC, RC
TCSD(1)
INTOSC(2)
TIOBST(4)
IOFS
Note 1:
TCSD (parameter 38) is a required delay when waking from Sleep and all Idle modes and runs concurrently
with any other required delays (see Section 3.4 “Idle Modes”). On Reset, INTOSC defaults to 1 MHz.
2:
Includes both the INTOSC 8 MHz source and postscaler derived frequencies.
3:
TOST is the Oscillator Start-up Timer (parameter 32). trc is the PLL Lock-out Timer (parameter F12); it is
also designated as TPLL.
4:
Execution continues during TIOBST (parameter 39), the INTOSC stabilization period.


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