Digilent 6021-210-000P-KIT - Manual (Page 7)

Universal Development Board™ Reference Manual
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Page 7 of 27
Many Microchip PIMs are not wired straight through and it is necessary to refer to the Microchip PIM information
sheet to understand how they are wired.
3.1 On-Board PIC32MX360
The UDB has a PIC32MX360F512L microcontroller soldered onto the board. This microcontroller is wired to the
PICtail™ Plus bus in the same manner as would be the case for a PIM plugged into the PIM Socket. This allows the
UDB board to be used for PIC32 application development without requiring the use of PIM or DIP socketed
microcontrollers.
Jumper JP11, labeled PIC32 Current on the board, can be used to measure the power supply current being
consumed by the on-board PIC32 microcontroller. To measure the on-board PIC32 operating current, remove the
shorting block from JP11 and insert an ammeter in series between the two pins of JP11. When not measuring
power supply current consumption of the on-board PIC32 microcontroller, ensure that the shorting block is
installed on JP11. The on-board PIC32 microcontroller will not receive power if the shorting block is not installed
on JP11. When not using the on-board PIC32 and using a PIM modules instead, it may still be necessary to have the
shorting block installed on JP11. Leaving the on-board PIC32 microcontroller unpowered may load the pins of the
PIM down and cause erratic operation of the processor on the PIM module.
Note: The PIC32 Current measurement jumper, JP11, only exists on Revision E and later UDB boards.
The jumper at JP2 is used to enable or disable the on-board PIC32MX360 microcontroller. When using the on-
board PIC32 microcontroller, ensure that no PIM is installed on the PIC Socket and insert a shorting block onto JP2.
This enables the on-board PIC32 for operation.
WARNING : Most Microchip programming tools, such as the PICkit® 3, are capable of generating the high
programming voltages necessary for programming some PIC microcontrollers. This programming voltage can be
as high as 13V for some devices. When programming these devices, the programming voltage is applied to the
MCLR pin. The MCLR signal from the programming tool will be connected to the MCLR pin of the on-board PIC32
device whenever the shorting block is installed on jumper JP2. If this programming voltage is applied to the
board while the shorting block is installed on JP2, the on-board PIC32 device will be destroyed. This situation can
occur in unexpected ways. For example, the Microchip MPLAB® or MPLAB® X development environment will
automatically cause the programming voltage to be applied when loading a project with a device selected where
it is required. Thus, it is possible to destroy the on-board PIC32 device merely by opening a project in the
MPLAB® development environment. As a safety precaution, do not leave the shorting block installed on JP2
unless actively using the on-board PIC32 device and only when a project known to be safe has been loaded into
the IDE.
4
PICtail™ Plus Card Edge Expansion Connectors
The UDB has a PICtail™ Plus interface that provides the board with basic functionality while still being easily
extendable to new technologies as they become available. The PICtail™ Plus interface is compatible with the
PICtail™ Plus line of expansion modules available from Microchip®.
The PICtail™ Plus interface is on the right side of the board and labeled PICtail™ Plus on the board. It is made up of
card edge socket, J12, and edge connector land pattern, J13. It is physically and electrically compatible with
PICtail™ Plus expansion modules available from Microchip. Most PICtail™ modules will plug vertically into socket,
J12, but some expansion boards are designed to be coplanar with the microcontroller board and will attach to the
card edge land pattern at J13.