PIC24FJ256GA110_10 Datasheet, PDF (115/330 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit, General Purpose Flash Microcontrollers with Peripheral Pin Select

PIC24FJ256GA110 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 oscillator system for PIC24FJ256GA110 family
devices has the following features:
• A total of four external and internal oscillator options
as clock sources, providing 11 different clock modes
• On-chip 4x PLL to boost internal operating frequency
on select internal and external oscillator sources
• 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:
PIC24FJ256GA110 FAMILY CLOCK DIAGRAM
OSCO
OSCI
SOSCO
SOSCI
Primary Oscillator
FRC
Oscillator
8 MHz
(nominal)
LPRC
Oscillator _{31 kHz (nominal)}
Secondary Oscillator
SOSCEN
Enable
Oscillator
XT, HS, EC
4 x PLL
XTPLL, HSPLL
ECPLL, FRCPLL
8 MHz
4 MHz
FRCDIV
CLKDIV<10:8>
FRC
LPRC
REFOCON<15:8>
Reference Clock
Generator
REFO
DIV/2
Peripherals
(FCY)
CLKO
CPU
SOSC
CLKDIV<14:12>
Clock Control Logic
Fail-Safe
Clock
Monitor
WDT, PWRT
Clock Source Option
for Other Modules
 2010 Microchip Technology Inc.
DS39905E-page 115