PIC24HJ64GP206A-I Datasheet, PDF (127/304 Pages) Microchip Technology – High-Performance,16-bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
9.0 OSCILLATOR
CONFIGURATION
Note 1: 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
Section 7. “Oscillator” (DS70227) of
the “dsPIC33F/dsPIC33F/PIC24H Family
Reference Manual”, which is available
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 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>
XT, HS, EC
S2
DOZE<2:0>
XTPLL, HSPLL,
PLL⁽¹⁾
ECPLL, FRCPLL
S1/S3
FCY
FP
FRC
Oscillator
FRCDIVN _S7
÷2
FOSC
TUN<5:0>
÷ 16
FRCDIV<2:0>
SOSCO
SOSCI
LPRC
Oscillator
Secondary Oscillator
LPOSCEN
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
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 M must be connected.
 2009 Microchip Technology Inc.
Preliminary
DS70592B-page 127