Digilent MX4cK - Manual (Page 21)

Cerebot MX4cK Reference Manual
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The following gives the Pmod connector
position, chipKIT pin number, and
microcontroller port and bit number for the
input capture units input pins:
• IC1 – JH-09, digital pin 54, RD08
• IC2 – JD-03, digital pin 26, RD09
• IC3 – JD-03, digital pin 30, RD10
• IC4 – JE-09, digital pin 38, RD11
• IC5 – JK-09, digital pin 70, RD12
When using the chipKIT MPIDE software, the
symbols PIN_IC1, PIN_IC2, PIN_IC3,
PIN_IC4, and PIN_IC5 can be used to access
the capture input pins.
Use of the input capture units is not currently
supported in the chipKIT MPIDE software. This
will be added in a future version.
External Interrupts
The PIC32 microcontroller provides five
external interrupt inputs. An external interrupt
input can be used to generate an interrupt to
the microprocessor CPU when the pin changes
state. They can be programmed to interrupt on
a rising edge or a falling edge on the pin.
Refer to the PIC32 Family Reference Manual,
Section 8, Interrupts for more information on
the operation of the external interrupts.
These are accessed using the attachInterrupt()
and detachInterrupt() functions when using the
chipKIT MPIDE software,. The interrupt
number is specified using the numbers 0-4, or
preferably, the symbols EXT_INT0 through
EXT_INT4.
The following gives Pmod connector position,
chipKIT pin number, and microcontroller I/O
port and bit number:
• INT0 – JH-08, digital pin 53, RD0
• INT1 – JH-07, digital pin 52, RE8
• INT2 – JE-07, digital pin 36, RE9
• INT3 – JF-01, digital pin 40, RA14
• INT4 – JF-02, digital pin 41, RA15
RTCC
The PIC32 microcontroller contains a low
frequency oscillator and Real Time
Clock/Calendar circuit, RTCC, that can be
used to maintain time and date information.
The operation of the RTCC requires a
32.768Khz frequency source. The crystal X2
position, just above and on the right of the
PIC32 microcontroller, IC1, is provided for the
user to solder in a 32Khz watch crystal. The
Citizen CFS206-32.768KDZF-UB is a crystal
part that can be used in this location.