Digilent MX3cK - Manual (Page 9)

Cerebot MX3cK Reference Manual
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connected to the 3.3V supply to clamp the
voltage.
The minimum output high voltage of the PIC32
microcontroller is rated at 2.4V when sourcing
12mA of current. When driving a high
impedance input (typical of CMOS logic) the
output high voltage will be close to 3.3V. Some
5V devices will recognize this voltage as a
logic high input, and some won’t. Many 5V
logic inputs will work reliably with 3.3V inputs.
If the 3.3V logic output is not sufficient for 5V
logic input to be reliably seen as a logic high
input signal, some external means must be
used to raise the output level. In some cases, a
pull-up resistor to 5V is sufficient. A pull-up
resistor in the range of 2Kohm–10kOhm can
be used. This technique should not be used
with pins that are not 5V tolerant on the PIC32
microcontroller.
RESET
A reset button is at the upper left corner of the
board. Pressing this button will reset the PIC32
microcontroller.