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PIC32MX3XX/4XX
8.0 OSCILLATOR
CONFIGURATION
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to the “PIC32MX Family
Reference Manual” Section 6.
“Oscillator Configuration” (DS61112),
which is available from the Microchip web
site (www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be avail-
“Memory Organization” in this data
sheet for device-specific register and bit
information.
The PIC32MX oscillator system has the following
modules and features:
? A total of four external and internal oscillator
options as clock sources
? On-chip PLL (phase-locked loop) with user-
selectable input divider, multiplier and output
divider to boost operating frequency on select
internal and external oscillator sources
? On-chip user-selectable divisor postscaler on
select oscillator sources
? Software-controllable switching between various
clock sources
? A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and permits safe application recovery
or shut down
? Dedicated on-chip PLL for USB peripheral
FIGURE 8-1:
PIC32MX3XX/4XX FAMILY CLOCK DIAGRAM
USB PLL
div x
UF IN
PLL x24
div 2
USB Clock (48 MHz)
Primary Oscillator (P OSC )
UF IN = 4 MHz
FUPLLDIV<2:0>
UFRCEN
FUPLLEN
C1 (3)
OSC1
XT, HS, EC
PBCLK
XTAL
R F (2)
To Internal
Logic
Enable
4 MHz ≤ F IN ≤ 5 MHz
F IN
div x PLL div y
XTPLL, HSPLL,
ECPLL, FRCPL L
Postscaler Peripherals
div x
C2 (3)
R S (1)
OSC2 (4)
PLL Input Divider
FPLLIDIV<2:0>
PLL Output Divider
PLLODIV<2:0>
PBDIV<2:0>
FRC
Oscillator
8 MHz typical
TUN<5:0>
COSC<2:0>
Postscaler
PLL Multiplier
PLLMULT<2:0>
div 16
FRC
FRC/16
FRCDIV
CPU and Select Peripherals
FRCDIV<2:0>
LPRC
Oscillator
31.25 kHz typical
LPRC
Secondary Oscillator (S OSC )
SOSCO
32.768 kHz
SOSCEN and FSOSCEN
S OSC
Clock Control Logic
SOSCI
Fail-Safe
Clock
Monitor
FSCM INT
FSCM Event
Notes:
1.
A series resistor, R S , may be required for AT strip-cut crystals.
2.
The internal feedback resistor, R F , is typically in the range of 2 to
10 M Ω.
NOSC<2:0>
COSC<2:0>
3.
4.
Refer to the “ PIC32MX Family Reference Manual ” Section 6.
“Oscillator Configuration” (DS61112) for help determining the best
oscillator components.
PBCLK out is available on the OSC2 pin in certain clock modes.
FSCMEN<1:0>
OSWEN
WDT, PWRT
Timer1, RTCC
? 2010 Microchip Technology Inc.
DS61143G-page 93
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