PIC24HJ128GP206-I Datasheet, PDF (121/286 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
8.0 OSCILLATOR
CONFIGURATION
Note:
This data sheet summarizes the features
of this group of PIC24HJXXXGPX06/X08/
X10 devices. It is not intended to be a
comprehensive reference source. To com-
plement the information in this data sheet,
refer to the “PIC24H Family Reference
Manual”. Refer to the Microchip web site
(www.microchip.com) for the latest
PIC24H Family Reference Manual
sections.
The PIC24HJXXXGPX06/X08/X10 oscillator system
provides:
• Various external and internal oscillator options as
clock sources
• An on-chip PLL to scale the internal operating
frequency to the required system clock frequency
• The internal FRC oscillator 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 8-1.
FIGURE 8-1:
PIC24HJXXXGPX06/X08/X10 OSCILLATOR SYSTEM DIAGRAM
PIC24H
Primary Oscillator
OSC2
XT, HS, EC
S2
DOZE<2:0>
S3
XTPLL, HSPLL,
OSC1
ECPLL, FRCPLL
S1
PLL⁽¹⁾
S1/S3
FCY
FRC
Oscillator
TUN<5:0>
FRCDIV<2:0>
÷ 16
SOSCO
SOSCI
LPRC
Oscillator
Secondary Oscillator
LPOSCEN
Note 1: See Figure 8-2 for PLL details
© 2007 Microchip Technology Inc.
÷2
FRCDIVN _S7
FOSC
FRCDIV16 _S6
FRC _S0
LPRC
S5
SOSC
S4
Clock Fail Clock Switch Reset
S7
NOSC<2:0> FNOSC<2:0>
WDT, PWRT,
FSCM
Timer 1
DS70175F-page 119