Microchip Technology MA240017 Data Sheet
2008-2011 Microchip Technology Inc.
DS39927C-page 91
PIC24F16KA102 FAMILY
9.0
OSCILLATOR
CONFIGURATION
CONFIGURATION
The oscillator system for the PIC24F16KA102 family of
devices has the following features:
• A total of five external and internal oscillator options
devices has the following features:
• A total of five external and internal oscillator options
as clock sources, providing 11 different clock
modes.
modes.
• On-chip 4x Phase Locked Loop (PLL) to boost
internal operating frequency on select internal and
external oscillator sources.
external oscillator sources.
• Software-controllable switching between various
clock sources.
• Software-controllable postscaler for selective
clocking of CPU for system power savings.
• System frequency range declaration bits for EC
mode. When using an external clock source, the
current consumption is reduced by setting the
declaration bits to the expected frequency range.
current consumption is reduced by setting the
declaration bits to the expected frequency range.
• A Fail-Safe Clock Monitor (FSCM) that detects clock
failure and permits safe application recovery or
shutdown.
shutdown.
provides a simplified diagram of the oscillator
system.
FIGURE 9-1:
PIC24F16KA102 FAMILY CLOCK DIAGRAM
Note:
This data sheet summarizes the fea-
tures of this group of PIC24F devices. It
is not intended to be a comprehensive
reference source. For more information
on Oscillator Configuration, refer to the
“PIC24F Family Reference Manual”
tures of this group of PIC24F devices. It
is not intended to be a comprehensive
reference source. For more information
on Oscillator Configuration, refer to the
“PIC24F Family Reference Manual”
,
Section 38. “Oscillator with 500 kHz
Low-Power FRC”
Low-Power FRC”
(DS39726).
Secondary Oscillator
SOSCEN
Enable
Oscillator
SOSCO
SOSCI
Clock Source Option
for Other Modules
for Other Modules
OSCI
OSCO
Primary Oscillator
XT, HS, EC
P
os
tsca
ler
CLKDIV<10:8>
WDT, PWRT, DSWDT
FRCDIV
31 kHz (nominal)
8 MHz
FRC
LPRC
Oscillator
SOSC
LPRC
Clock Control Logic
Fail-Safe
Clock
Monitor
FRC
4 x PLL
XTPLL, HSPLL
ECPLL,FRCPLL
8 MHz
4 MHz
4 MHz
CPU
Peripherals
P
o
st
sca
ler
CLKDIV<14:12>
CLKO
Reference Clock
Generator
REFO
REFOCON<15:8>
Oscillator
500 kHz
LPFRC
Oscillator