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The topic of stimulus les brings up an important point. When debugging an application, the simulator must be set up so that it will always run the same way. This philosophical point is important and one that I want to make sure you follow. If the simulated application runs differently each time, you will have a hard time trying to work through problems and xing them. When you debug your application using a simulator, you should focus on xing the problem, not repeatedly setting up the simulator and stimulus for testing a piece of code. The processor block is obviously the heart of the simulator, with the user interface commanding it to execute, execute to breakpoint, single step, or stop. The processor model is an extremely complex piece of software. Not only does it have to fetch and execute instructions as well as access registers, but it also has to manage such peripheral functions as TMRO interrupts and the watchdog timer. Making the design of this module even more complex, the execution of the simulated instructions must be as fast as possible. The user interface is the primary window into the application code and as such should be as con gurable as possible to allow for user preferences as well as displaying variables and I/O registers based on the user s preferences. Along with displaying customizable registers, the simulator should work through the code source, rather than the simple instructions. In the rst edition of this book, I provided Microchip s MPSIM MS-DOS commandline simulator on the diskette that came with the book. This simulator provided all the features I have discussed in this section except for a full source le display. The ability to see how code executes from a source code view is critical for me and made working with MPSIM dif cult. Having this capability in the MPLAB IDE simulator makes debugging application software much easier and more ef cient.
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The next step up from a simulator is a chip emulator, which replaces the PIC microcontroller in your hardware application and provides a connection to your PC, allowing you to monitor the execution of the application in hardware. The emulator block diagram looks like Fig. 3.8 and shows that the emulator consists of a piece of hardware plugged into the application to replace the PIC microcontroller. The MCU replacement
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Figure 3.8 A microcontroller emulator consists of a chip replacement connected to external hardware that is controlled by a PC.
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hardware is usually connected to a block of hardware that provides control and operational monitoring of the emulator chip. To ensure that there are no critical time delays between the application circuitry and the controlling hardware, the cable connecting the two is usually quite short, often less than 6 inches (15 cm). An advantage of an emulator over the simulator is that actual pin I/O signals can be observed, both from the processor s perspective as well as from the circuits. As well, the emulator often has the same hardware as the actual device, so there are no missing peripheral interface functions. The best method of providing an emulator is for the manufacturer to provide a bondout chip. This chip is built from the same silicon as the actual microcontroller but has connections to memory and the chip execution control hardware, which allows an external device to control and monitor its operation. Microchip designs the PIC microcontroller chips with emulation in mind; the chips all contain the emulator functions, but when used in a typical application, the pads on the chip providing these functions are normally left unconnected. The bond-out devices are the same chips that are used in the applications so the operation of the bond-out chip in the application will be identical to that of the packaged chip that will be used in the nal application. There are two disadvantages to working with an emulator. The rst one is cost. Emulators generally cost $2,000 or more and require separate pods for each device being emulated (which makes sense because each device is the unique chip). This cost is not signi cant for many companies, but for small companies and individuals, it can be. To help offset the costs, there are options such as Microchip s MPLAB ICD 2 debugger (discussed in the next section). The other problem with emulators is the dif culty in connecting them to a circuit and the unreliability of the connection once it is in the circuit. Microchip s MPLAB-2000 emulator provides a small tripod to hold the emulator control hardware close to the target circuit without placing any strain on the cable connection.
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