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Figure 5.9 The ICD RJ-45 connector can be mounted to the product PCB to allow direct programming and debug connection to the PIC microcontroller.
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powered from the application; an extra 70 mA at 5V should be available for the module card s power requirements.
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The software changes required to allow MPLAB ICD 2 to be used to help debug an application are surprisingly minimal and will probably not affect the overall operation of the PIC in the application or require conditional builds. The single change that must be made to support ICD is the use of a nop instruction at the reset address (0). Rather than worry about when the nop should be used and when it can be left out, I simply put it into all my application code, regardless of whether or not the PIC microcontroller part number selected for the application supports it. I would even go so far as to say that the nop instruction should be put in low-end PIC microcontroller applications to ensure that you never forget to put it in. The ICD interface code that runs in the PIC microcontroller is installed automatically in the last 256 instructions of the chip. In earlier versions of MPLAB IDE, this memory would have to be reserved, but the current versions of the integrated development environment will give you error messages if you have code or data that extends into this region. Finally, you have to make sure that the con guration fuses will not enable the code protection or disable the Flash self-write features of the PIC microcontroller. To ensure that there will be no problems, the following four options should be selected in the application s con guration fuses:
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No code protection Debug interface enabled Internal program memory writes enabled Watchdog timer disabled
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All other con guration fuse values, including clocking and reset options, can be used with MPLAB ICD 2. If any of the options above are required for your application, you will have to implement some kind of conditional build in which you can specify the con guration values when required.
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One set of de nitions that confuses many people is the difference between ICSP (incircuit serial programming) and ICD (in-circuit debugger). The functions seem similar and in the cases of the MPLAB ICD 2 and MPLAB REAL ICE the tools can be used for both functions. The primary difference that you should be aware of is the connectors used. ICD uses the RJ-45 connector, shown in Fig. 5.9. ICSP uses the 6-pin interface shown in Fig. 5.10. The ICSP connector can be easily plugged into a breadboard or other PTH chip prototyping system, whereas the ICD connector requires a PCB with the RJ-45 connector footprint built in to provide the same capabilities.
EMULATORS AND DEBUGGERS
0.1" (2.54 mm) Between Centers
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Figure 5.10 The ICSP connector has the same pinout as the ICD connector, but places the pins 0.1in apart for easy use with PTH chips and boards.
Fortunately, as will be shown in the next section, the schematic wiring of the two interfaces can be identical and the two functions (programming and debugging) can be combined into one interface using a small PCB like Microchip s ICD 2 to ICSP adapter (Microchip part number AC164110), shown in Fig. 5.11. This adapter allows the ICD 2 to be used to program and debug PIC microcontrollers wired into breadboards and other PTH development tools easily and fairly inexpensively.
HARDWARE DESIGN FOR ICD AND ICSP
When I rst started working with ICD (and ICSP), I liked the idea of creating circuitry that would allow the I/O pins used for ICD and programming to be shared with the
Figure 5.11 The Microchip ICD 2 to ICSP adapter (part number AC164110) is an easy way to use the MPLAB ICD 2 debugger with breadboarded applications.
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