PIC18LF8520-IPT301 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF8520-IPT301

64/80-Pin High-Performance, 256 Kbit to 1 MbitEnhanced Flash Microcontrollers with A/D

Microchip Technology 

PIC18F6520/8520/6620/8620/6720/8720

If the main oscillator is configured for HS-PLL mode, an

oscillator start-up time (TOST), plus an additional PLL

time-out (TPLL), will occur. The PLL time-out is typically

2 ms and allows the PLL to lock to the main oscillator

frequency. A timing diagram, indicating the transition

from the Timer1 oscillator to the main oscillator for

HS-PLL mode, is shown in Figure 2-10.

FIGURE 2-10:

TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (HS WITH PLL)

Q4

Q1

TT1P

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

T1OSI

OSC1

OSC2

TOST

TPLL

PLL Clock

Input

Internal System

Clock

SCS

(OSCCON<0>)

Program Counter PC

TOSC

1

TSCS

234 56 78

PC + 2

PC + 4

Note 1: TOST = 1024 TOSC (drawing not to scale).

If the main oscillator is configured in the RC, RCIO, EC

or ECIO modes, there is no oscillator start-up time-out.

Operation will resume after eight cycles of the main

oscillator have been counted. A timing diagram,

indicating the transition from the Timer1 oscillator to the

main oscillator for RC, RCIO, EC and ECIO modes, is

shown in Figure 2-11.

FIGURE 2-11:

TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (RC, EC)

Q3

T1OSI

OSC1

OSC2

Internal System

Clock

SCS

(OSCCON<0>)

Program

Counter

Q4

Q1

PC

TT1P

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

TOSC

12 34 5 6 7 8

TSCS

PC + 2

PC + 4

Note 1: RC Oscillator mode assumed.

 2003-2013 Microchip Technology Inc.

DS39609C-page 27

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