PIC24HJXXXGPX06A Datasheet, PDF (127/294 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
9.0 OSCILLATOR
CONFIGURATION
Note:
This data sheet summarizes the features
of the PIC24HJXXXGPX06A/X08A/X10A
family 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 Reference Manual”, Section 7.
“Oscillator” (DS70227), which is
available from the Microchip website
(www.microchip.com).
The PIC24HJXXXGPX06A/X08A/X10A 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:
PIC24HJXXXGPX06A/X08A/X10A 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.
Preliminary
DS70592A-page 125