Microchip Technology Microstick for 5V PIC24 K Series Devices User’s Guide
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2/21/13
Microstick for 5V PIC24 K Series Devices
Overview
The Microstick for 5V PIC24 K Series Devices is designed to provide an easy-to-use,
economical development environment for 5V, 16-bit microcontrollers. The board
includes an integrated debugger/programmer, a socket for the target microcontroller
chip and pins that facilitate insertion into a prototyping board for extremely flexible
development.
Installing MPLAB® IDE and C Compilers
The MPLAB® Integrated Development Environment (IDE) should be installed prior
to using the Microstick for 5V PIC24 K Series Devices. This board is designed to
run with MPLAB X IDE Version 1.60 or later. While the MPLAB IDE provides
assembler tools for development, most code examples provided for Microchip
devices are written in C language and require a C compiler to be installed. Microchip’s MPLAB XC16 Compiler seamlessly integrates into the MPLAB IDE. Both
the MPLAB IDE and XC16 Compiler are free and available for download at:
www.microchip.com/mplabx and www.microchip.com/xc16, respectively.
Note 1: MPLAB XC16 Evaluation Version (free) – All optimization levels are
enabled for 60 days, then limits to optimization, Level O1. The compiler
will continue to function, but code size may increase. There are no
restrictions on the use of this C compiler (see license text for details).
Running Applications
After downloading and installing the development tools, please use the following
procedure to build, run and debug your software:
1. Open the MPLAB X IDE application and close any open projects.
2. Open the Microstick application project by navigating to the installation directory
and selecting the “pic24fv16km202_microstick_demo.X” folder.
3. Connect the Microstick board to the development computer via a USB cable.
4. Open the project properties by selecting File->Project Properties
5. Ensure the correct device is the selected device in the Device
menu.
6. Select the Microstick from the Hardware Tool
Microchip Starter Kits>Starter Kits (PKOB)
7. Build, program and run the Microstick demo application by selecting
Debug>Debug Project
.
8. Install Jumper, JP1, to enable the on-board LED for RA0 to ensure the
program is running.
For more information on building, running and debugging your application, refer to
the MPLAB IDE Help.
. It will be listed under
.
(1)
.
dropdown
DS50002142A
Developing Applications
Microstick for 5V PIC24 K Series Devices only implements circuitry for low-voltage
ICSP™ programming. To enable low-voltage ICSP programming, it is important to
always configure the microcontroller to enable MCLR pin function, rather than RA5
general purpose, input pin function.
The following assembly language directive enables the MCLR
device Configuration bits:
; MCLR Pin Enable bit (RA5 input disabled; MCLR enabled)
config __FPOR, MCLRE_ON
In XC16, the same thing is accomplished with this code:
// MCLR Pin Enable bit (RA5 input disabled; MCLR enabled)
FPOR(MCLRE_ON)
Warning: Always program the microcontroller with MCLR
enabled so that the Microstick for 5V PIC24 K Series Devices can
be used to program/debug the chip in the future.
If the microcontroller is programmed with MCLR
disabled (RA5 input is enabled), the Microstick will no longer program or debug firmware on the microcontroller because Microstick
does not have circuitry to use high-voltage ICSP entry. REAL
ICE™, MPLAB ICD 3 and PICkit™ 3 are examples of high-voltage
ICSP tools that can be used to recover the part.
The slide switch, labeled S3 on the PCB, is used to select which pair of PGECx/
PGEDx pins to use for In-Circuit Serial Programming™ (ICSP™). When moved
towards the PDIP socket, the Microstick is set for using PGEC3/PGED3. When
moved towards the USB connector, the Microstick is configured for PGEC1/
PGED1.
To allow for debugging to work in MPLAB, the device’s Configuration bits must be
set up to indicate which PGECx/PGEDx pins are actually being used in the circuit.
For example, in assembly language, you may need directives such as this:
.include "p24Fxxxx.inc"
; ICD Pin Placement Select (EMUC/EMUD share PGC3/PGD3)
config __FICD, ICS_PGx3
pin function in the
pin functionality
pin function
Hardware Design
The Microstick for 5V PIC24 K Series Devices is USB bus powered. The device is
powered directly from the 5V USB bus. Turning power on/off to the target application is controlled by the MPLAB IDE via the FPF2102 load switch. The FPF2102
load switch automatically shuts down power to the target if the current exceeds a
trip point of 200 mA to 400 mA. This may help protect the host PC USB port from
accidental shorting of power supply pins in the target application circuit.
The Microstick may be plugged into a prototyping board to develop external application circuitry with the PIC
pins are provided, labeled P1, P2 and P3. Normally, the Skinny PDIP (SPDIP) layout (300 mils) should be used by populating rows, P1 and P2. Optionally, rows, P1
and P3, may be populated instead to provide a wide PDIP layout (600 mils). The
unpopulated, single in-line pin header for soldering into P3 is available separately
as Digi-Key Part Number ED7464-ND.
®
MCU. On the bottom side of the board, three rows of
In XC16, the same thing can be accomplished with this code:
#include <p24Fxxxx.h>
// ICD Pin Placement Select (EMUC/EMUD share PGC3/PGD3)
_FICD(ICS_PGx3)
An XC16 firmware source code example for blinking the Microstick’s LED is
provided on the Microchip web site (see http://www.microchip.com/microstick).
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