PIC32MX440F256H-80I Datasheet, PDF (556/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
25.3 Interrupts
There are no Interrupt configuration registers or bits for
the CVREF module. The CVREF module does not
generate interrupts.
25.4 I/O Pin Control
The CVREF module has the ability to output to a pin.
When the CVREF module is enabled and CVROE
(CVRCON<6>) is ‘1’, the output driver for the CVREF
pin is disabled and the CVREF voltage is available at the
pin. For proper operation, the TRIS bit corresponding to
the CVREF pin must be a ‘1’ when CVREF is to be output
to a pin. This disables the Digital Input mode for the pin
and prevents undesired current draw resulting from
applying an analog voltage to a digital input pin. The
output buffer has very limited drive capability. An exter-
nal buffer amplifier is recommended for any application
that uses the CVREF voltage externally. An output
capacitor may be used to reduce output noise. Use of
an output capacitor will increase settling time.
TABLE 25-4: PINS ASSOCIATED WITH A COMPARATOR
Pin Name
Module
Control
Controlling
Bit Field
Required
TRIS Bit
Setting
Pin
Type
Buffer
Type
Description
CVREF
ON
CVROE
Input
A, O
— CVREF Output
Legend: ST = Schmitt Trigger input with CMOS levels, I = Input, O = Output, A = Analog, D = Digital
DS61143E-page 554
Preliminary
© 2008 Microchip Technology Inc.