PIC24FJ128GC010 Datasheet, PDF (159/472 Pages) Microchip Technology – 16-Bit Flash Microcontrollers with 12-Bit Pipeline A/D, Sigma-Delta A/D, USB On-The-Go and XLP Technology

PIC24FJ128GC010 FAMILY
9.0 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”,
“Oscillator” (DS39700).
The oscillator system for PIC24FJ128GC010 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 USB PLL block to provide a stable 48 MHz
clock for the USB module, as well as a range of
frequency options for the system clock
• 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 9-1.
FIGURE 9-1:
PIC24FJ128GC010 FAMILY CLOCK DIAGRAM
OSCO
OSCI
Reference
from USB
D+/D-
SOSCO
SOSCI
Primary Oscillator
PIC24FJ128GC010 Family
USB PLL
PLL &
DIV
XT, HS, EC
XTPLL, HSPLL
ECPLL, FRCPLL
PLLDIV<2:0> CPDIV<1:0>
48 MHz USB Clock
REFOCON<15:8>
Reference Clock
Generator
REFO
8 MHz
FRC ^(nominal)
Oscillator
8 MHz
4 MHz
FRC
Self-Tune
Control
LPRC ^{31 kHz (nominal)}
Oscillator
RCDIV<10:8>
Secondary Oscillator
SOSCEN
Enable
Oscillator
FRCDIV
FRC
LPRC
Peripherals
CLKO
CPU
SOSC
DOZE<14:12>
Clock Control Logic
Fail-Safe
Clock
Monitor
WDT, PWRT
Clock Source Option
for Other Modules
 2012-2013 Microchip Technology Inc.
DS30009312B-page 159