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MS-DOS. While there is an MS-DOS prompt under Windows/3.1x/95/98/NT/2000, you cannot count on it being able to access all the hardware in the system. This is of considerable concern with programmers that use the parallel port; if you do not have administrator access in Windows/NT/2000, you will probably nd that you cannot use the programmer without your network administrator granting a session special access. Linux offers MS-DOS support, but this may be limited in the I/O ports that are accessible from it. The safest bet is to only use a programmer that accesses the PC via the RS-232 serial port. RS-232 support and drivers are available under all operating systems without requiring special access rights. If you are going to use a programmer that accesses to your PC via the parallel port, I suggest that you buy a second parallel port adapter if you are using the primary parallel port for a printer. Doubling up the functions on a PC s parallel port is time consuming and probably won t work that well with different software applications claiming the hardware as their own. A USB, ISA, or PCI parallel port adapter card can be purchased new for less than $15 and you will feel it is worth it after just a few minutes of working with it instead of sharing a port with other devices. The information provided in this section should be available from the programmer manufacturer. If it isn t, then look at another programmer. Over the years, I have had enough problems with balky PC adapters that I recommend you avoid any potential problems and nd a programmer that will be well supported by an established company or has hardware interfaces that do not require software upgrades as time goes on. The programmer should have a 5-pin ICSP cable adapter that can be bought separately. This cable provides power, Vpp, and programming clock and data signals to a connector built onto a product. The connector consists of a 5x1 connector with pins spaced 0.100in apart and would provide a connection to the target PIC microcontroller with the features discussed in Chap. 5.
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The purpose of the PIC microcontroller emulators and debuggers is to provide you with an interface into the executing part, allowing you to monitor actual data, external I/O pin signals and stop at speci c locations in the application. Emulators replace the entire circuit whereas debuggers involve specialized hardware built into the MCU to allow you to monitor the execution of the device in the application. In the debugging process, emulators and debuggers can be invaluable for identifying the state of the device and the circuitry it is connected to as part of the characterization and veri cation steps of failure analysis. Unfortunately, they are often not used for this purpose, instead they are used as an integral part of the development process. The danger of using an emulator or debugger as a development tool is that the possible resulting application is not fully thought out and can have numerous problems that are hard to nd. There is a ne line between PIC microcontroller emulators and debuggers. The reason for the dif culty distinguishing between the two is the similar operation of the two types of devices. The emulator replaces the microcontroller chip with a special chip that consists of a microcontroller with a high speed interface to an emulator, allowing the operation of the chip to be controlled and monitored. A debugger consists of a PIC MCU chip with specialized hardware that allows control of the processor and the ability to sample different registers. The primary difference between the two consists of the debugger s need to allocate two or three I/O pins to the controller connection (the emulator does not sacri ce any I/O pins for this purpose), and communication of the debugger to the control hardware is relatively slow (especially when compared to the emulator). If you are familiar with either the emulator or debugger, you won t have any trouble working with the other. There are four types of emulators that are available for the PIC microcontroller. While there are a number of low-cost emulators available (including the Emu-II presented later in this chapter), the full device emulator (like the MPLAB ICE-2000) is the best device on the market to use. The rst type of emulator is a simple hardware interface
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