PIC32MX440F512H-80I Datasheet, PDF (55/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

4.0 OSCILLATORS
Note:
This data sheet summarizes the features of
the PIC32MX3XX/4XX family of devices. It
is not intended to be a comprehensive refer-
ence source. Refer to the “PIC32MX Family
Reference Manual” (DS61132) for a
detailed description of this peripheral.
This section describes the PIC32MX3XX/4XX oscilla-
tor system and its operation. 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 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 shutdown
A simplified diagram of the oscillator system is shown
in Figure 4-1.
PIC32MX3XX/4XX
© 2008 Microchip Technology Inc.
Preliminary
DS61143E-page 53