PIC32MX440F256H-80I Datasheet, PDF (84/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
4.3.1
OSCI AND OSCO PIN FUNCTIONS
IN NON-EXTERNAL OSCILLATOR
MODES
When the primary oscillator (POSC) on OSCI and
OSCO is not configured as a clock source the OSCI pin
is automatically reconfigured as a digital I/O. In this
configuration, as well as when the primary oscillator is
configured for EC mode (POSCMD1:POSCMD0 = 00),
the OSCO pin can also be configured as a digital I/O by
programming the OSCIOFCN Configuration bit.
When OSCIOFCN is unprogrammed (‘1’), a PBCLK is
available on OSCO for testing or synchronization pur-
poses. With OSCIOFCN programmed (‘0’), the OSCO
pin becomes a general purpose I/O pin. In both of these
configurations, the feedback device between OSCI and
OSCO is turned off to save current.
4.3.2
SOSCI AND SOCI PIN FUNCTIONS
IN NON-EXTERNAL OSCILLATOR
MODES
When the secondary oscillator (SOSC) on SOSCI and
SOSCO pin is not configured as a clock source the pins
are automatically reconfigured as a digital I/O.
DS61143E-page 82
Preliminary
© 2008 Microchip Technology Inc.