PIC24FJ256GB210 Datasheet, PDF (137/386 Pages) Microchip Technology – 64/100-Pin, 16-Bit Flash Microcontrollers with USB On-The-Go (OTG)

PIC24FJ256GB210 FAMILY
8.0 OSCILLATOR
CONFIGURATION
Note:
This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 6. “Oscillator” (DS39700). The
information in this data sheet supersedes
the information in the FRM.
The oscillator system for PIC24FJ256GB210 family
devices has the following features:
• A total of four external and internal oscillator options
as clock sources, providing 11 different clock modes
• An on-chip PLL block to boost internal operating
frequency on select internal and external oscillator
sources, and to provide a precise clock source for
peripherals, such as USB
• Software controllable switching between various
clock sources
• Software controllable postscaler for selective
clocking of CPU for system power savings
• A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and permits safe application recovery
or shutdown
• A separate and independently configurable system
clock output for synchronizing external hardware
A simplified diagram of the oscillator system is shown
in Figure 8-1.
FIGURE 8-1:
PIC24FJ256GB210 FAMILY CLOCK DIAGRAM
OSCO
OSCI
PIC24FJ256GB210 Family
Primary Oscillator
USB PLL
PLL
&
DIV
XT, HS, EC
XTPLL, HSPLL
ECPLL, FRCPLL
PLLDIV<2:0> CPDIV<1:0>
FRC
Oscillator
8 MHz
(nominal)
8 MHz
4 MHz
FRCDIV
CLKDIV<10:8>
FRC
48 MHz USB Clock
REFOCON<15:8>
Reference Clock
Generator
REFO
Peripherals
CLKO
SOSCO
SOSCI
LPRC
Oscillator _{31 kHz (nominal)}
Secondary Oscillator
SOSCEN
Enable
Oscillator
LPRC
CPU
SOSC
CLKDIV<14:12>
Clock Control Logic
Fail-Safe
Clock
Monitor
WDT, PWRT
Clock Source Option
for Other Modules
 2010 Microchip Technology Inc.
DS39975A-page 137