PIC24HJ64GP506-I Datasheet, PDF (123/292 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
9.0 OSCILLATOR
CONFIGURATION
Note:
This data sheet summarizes the features
of the PIC24HJXXXGPX06/X08/X10 fam-
ily of devices. However, it is not intended
to be a comprehensive reference source.
To complement the information in this data
sheet, refer to the “PIC24H Family Refer-
ence Manual”, Section 7. “Oscillator”
(DS70227), which is available from the
Microchip website (www.microchip.com).
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 9-1.
FIGURE 9-1:
PIC24HJXXXGPX06/X08/X10 OSCILLATOR SYSTEM DIAGRAM
Primary Oscillator
OSC1
R⁽²⁾
S3
OSC2
S1
POSCMD<1:0>
PIC24H
XT, HS, EC
S2
DOZE<2:0>
XTPLL, HSPLL,
PLL⁽¹⁾
ECPLL, FRCPLL
S1/S3
FCY
FP
FRC
Oscillator
÷2
FRCDIVN _S7
FOSC
TUN<5:0>
FRCDIV<2:0>
÷ 16
FRCDIV16 _S6
FRC _S0
SOSCO
SOSCI
LPRC
Oscillator
Secondary Oscillator
LPOSCEN
LPRC
S5
SOSC
S4
Clock Fail Clock Switch Reset
S7
NOSC<2:0> FNOSC<2:0>
WDT, PWRT,
FSCM
Timer 1
Note 1: See Figure 9-2 for PLL details.
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.
DS70175H-page 121