PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 24
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
2.5
A Phase Locked Loop circuit is provided as a pro-
grammable option for users that want to multiply the
frequency of the incoming crystal oscillator signal by 4.
For an input clock frequency of 10 MHz, the internal
clock frequency will be multiplied to 40 MHz. This is
useful for customers who are concerned with EMI due
to high frequency crystals.
FIGURE 2-5:
DS30475A-page 24
HS4 (PLL)
OSC2
OSC1
PLL BLOCK DIAGRAM
Crystal
Osc
F
IN
Comparator
F
OUT
Phase
Advanced Information
FOSC2:FOSC0 = ‘110’
Loop
Filter
The PLL can only be enabled when the oscillator con-
figuration bits are programmed for HS mode. If they
are programmed for any other mode, the PLL is not
enabled and the system clock will come directly from
OSC1.
The PLL is one of the modes of the FOSC2:FOSC0
configuration bits. The oscillator mode is specified dur-
ing device programming.
A PLL lock timer is used to ensure that the PLL has
locked before device execution starts. The PLL lock
timer has a time-out referred to as T
Divide by 4
VCO
2000 Microchip Technology Inc.
PLL
.
SYSCLK
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