PIC24F08KA102-I Datasheet, PDF (91/278 Pages) Microchip Technology – 20/28-Pin General Purpose, 16-Bit Flash Microcontrollers with nanoWatt XLP Technology

PIC24F16KA102 FAMILY
9.0 OSCILLATOR
CONFIGURATION
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”,
Section 38. “Oscillator with 500 kHz
Low-Power FRC” (DS39726).
The oscillator system for the PIC24F16KA102 family of
devices has the following features:
• A total of five external and internal oscillator options
as clock sources, providing 11 different clock
modes.
• On-chip 4x Phase Locked Loop (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.
• 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.
• A Fail-Safe Clock Monitor (FSCM) that detects clock
failure and permits safe application recovery or
shutdown.
Figure 9-1 provides a simplified diagram of the oscillator
system.
FIGURE 9-1:
PIC24F16KA102 FAMILY CLOCK DIAGRAM
OSCO
OSCI
SOSCO
SOSCI
Primary Oscillator
8 MHz
FRC
Oscillator
500 kHz
LPFRC
Oscillator
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
Peripherals
CLKO
CPU
SOSC
CLKDIV<14:12>
Clock Control Logic
Fail-Safe
Clock
Monitor
WDT, PWRT, DSWDT
Clock Source Option
for Other Modules
 2008-2011 Microchip Technology Inc.
DS39927C-page 91