PIC24HJ128GP802-I/ML View Datasheet(PDF) - Microchip Technology
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PIC24HJ128GP802-I/ML Datasheet PDF : 357 Pages
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PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04
9.0 OSCILLATOR
CONFIGURATION
Note 1: This data sheet summarizes the features
of
the
PIC24HJ32GP302/304,
PIC24HJ64GPX02/X04
and
PIC24HJ128GPX02/X04 families of
devices. It is not intended to be a compre-
hensive reference source. To comple-
ment the information in this data sheet,
refer to Section 39. “Oscillator (Part
III)” (DS70308) of the “dsPIC33F/PIC24H
Family Reference Manual”, which is avail-
able from the Microchip website
(www.microchip.com).
2: Some registers and associated bits
described in this section may not be avail-
able on all devices. Refer to Section 4.0
“Memory Organization” in this data
sheet for device-specific register and bit
information.
The PIC24HJ32GP302/304, PIC24HJ64GPX02/X04
and PIC24HJ128GPX02/X04 oscillator system
provides:
• External and internal oscillator options as clock
sources
• An on-chip Phase-Locked Loop (PLL) to scale the
internal operating frequency to the required
system clock frequency
• An internal FRC oscillator that can also be used
with the PLL, thereby allowing full-speed
operation without any external clock generation
hardware
• Clock switching between various clock sources
• Programmable clock postscaler for system power
savings
• A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and takes fail-safe measures
• A Clock Control register (OSCCON)
• Nonvolatile Configuration bits for main oscillator
selection.
A simplified diagram of the oscillator system is shown
in Figure 9-1.
FIGURE 9-1:
PIC24HJ32GP302/304, PIC24HJ64GPX02/X04 AND PIC24HJ128GPX02/X04
OSCILLATOR SYSTEM DIAGRAM
Primary Oscillator
OSC1
POSCCLK
R(2)
S3
S1
OSC2
POSCMD<1:0>
DOZE<2:0>
XT, HS, EC
S2
FCY
XTPLL, HSPLL,
PLL(1)
ECPLL, FRCPLL
S1/S3
FVCO(1)
FP
FRC
Oscillator
÷2
FRCDIVN S7
FOSC
TUN<5:0>
FRCDIV<2:0>
÷ 16
SOSCO
SOSCI
LPRC
Oscillator
Secondary Oscillator
LPOSCEN
FRCDIV16 S6
FRC S0
LPRC
S5
SOSC
S4
Clock Fail Clock Switch Reset
Note 1: See Figure 9-2 for PLL details.
S7
NOSC<2:0> FNOSC<2:0>
WDT, PWRT,
FSCM
Timer1
2: If the Oscillator is used with XT or HS modes, an extended parallel resistor with the value of 1 MΩ must be
connected.
© 2009 Microchip Technology Inc.
Preliminary
DS70293D-page 119
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