PIC24FJ16MC101_12 Datasheet, PDF (101/350 Pages) Microchip Technology – 16-bit Microcontrollers (up to 32 KB Flash and 2 KB SRAM)

PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
8.0 OSCILLATOR
CONFIGURATION
Note 1: This data sheet summarizes the features
of the PIC24FJ16MC101/102 and
PIC24FJ32MC101/102/104 family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 6. “Oscillator”
(DS39700) in the “PIC24F Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com).
2: It is important to note that the
specifications in Section 26.0 “Electri-
cal Characteristics” of this data sheet,
supercede any specifications that may be
provided in PIC24F Family Reference
Manual sections.
3: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
The PIC24FJ16MC101/102 and PIC24FJ32MC101/
102/104 oscillator system provides:
• External and internal oscillator options as clock
sources
• An on-chip 4x Phase-Locked Loop (PLL) to scale
the internal operating frequency to the required
system clock frequency
• An internal FRC oscillator that can also be used
with the PLL, thereby allowing full-speed
operation without any external clock generation
hardware
• Clock switching between various clock sources
• Programmable clock postscaler for system power
savings
• A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and takes fail-safe measures
• A Clock Control register (OSCCON)
• Nonvolatile Configuration bits for main oscillator
selection
A simplified diagram of the oscillator system is shown
in Figure 8-1.
FIGURE 8-1:
OSCILLATOR SYSTEM DIAGRAM
Primary Oscillator (POSC)
OSC1
R⁽¹⁾
S3
OSC2
S1
POSCMD<1:0>
4x PLL
MS, HS, EC
S2
MSPLL, ECPLL,
FRCPLL
S1/S3
DOZE<2:0>
FCY⁽²⁾
FRC
Oscillator
TUN<5:0>
÷ 16
FRCDIV<2:0>
SOSCO
LPRC
Oscillator
Secondary Oscillator (SOSC)
FRCDIVN _S7
÷2
FRCDIV16 _S6
FRC
S0
LPRC
S5
SOSC
S4
FP⁽²⁾
(To peripherals)
Fosc
SOSCI
LPOSCEN
Clock Fail Clock Switch Reset
S7
NOSC<2:0> FNOSC<2:0>
WDT, PWRT, FSCM
Timer 1
Note 1:
2:
If the Oscillator is used with MS or HS modes, an extended parallel resistor with the value of 1 MΩ must be connected.
The term FP refers to the clock source for all peripherals, while FCY refers to the clock source for the CPU. Throughout this document,
FP and FCY are used interchangeably, except in the case of DOZE mode. FP and FCY are different when DOZE mode is used with a
doze ratio of 1:2 or lower.
© 2011-2012 Microchip Technology Inc.
Preliminary
DS39997C-page 101