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PIC18F2525 Datasheet(PDF) 42 Page - Microchip Technology |
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PIC18F2525 Datasheet(HTML) 42 Page - Microchip Technology |
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42 / 412 page  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. |
Similar Part No. - PIC18F2525_08 |
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Similar Description - PIC18F2525_08 |
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