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Another issue you should be aware of, especially if you are buying a used PICSTART Plus, is rmware revisions. The early programmers had a PIC17C44, which had to be erased (using ultraviolet light) and then programmed with new rmware periodically. This operation was accomplished using a PIC17C44 with the old rmware inside the programmer, programming an erased PIC17C44, and then the two were swapped. The PIC17C44 was changed to a PIC18 Flash-based device that doesn t need to be erased outside of the programmer, but there were some programmers that were too old to take the Flash-based part and are now obsolete. The PICSTART Plus is a development programmer and as such does not check the contents of a programmed part at low voltage for prototyping operations. The full programming algorithm, as speci ed by Microchip, includes a veri cation step at 4.5V. The PICSTART Plus, with its Vdd at a nominal 5V, cannot provide this function. Microchip will not consider a PIC microcontroller to be production programmed by the PICSTART Plus and will not respond to eld problems with chips that are having problems, if the PICSTART Plus is used to burn the programs onto them. The 5V-only programming will be a problem for some newer parts that are not designed to work with Vdd above 3.6V, and applying 5V will damage them. The PICSTART Plus package consists of the PICSTART Plus, a power supply, an RS232 nine-pin straight through with male to female cable connectors. A sample 16F84 and CD-ROM containing data sheets, MPLAB, and applications notes are also included to help you get started.
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MPLAB PM3 UNIVERSAL DEVICE PROGRAMMER
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If you require a production level PIC microcontroller programmer, or need the ability to program a surface mount device, then you should look at the MPLAB PM3 Universal Device Programmer from Microchip (Fig. 4.17). This product is the follow-up to the Promate II and can work with the earlier programmer s adapter modules if you have already invested in this programmer. The MPLAB PM3 is much more exible than the PICSTART Plus and offers the following additional features:
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Executes from MPLAB IDE or the MS-DOS command line Implements complete programming speci cation for all PIC microcontrollers Interfaces to the PC through RS-232 or USB Provides production low voltage verify Has a very fast programming time Has three operating modes: PC Host mode with MPLAB IDE control Safe mode for secure data Stand-alone mode Interchangeable sockets for PTM, SMT, and ICSP cabling as well as an interface for Promate II sockets Also programs Microchip serial EPROMS Can serialize parts
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Figure 4.17 The MPLAB PM3 Universal Device Programmer can be used for all Microchip microcontrollers regardless of package type and operating voltages. SD/MMC sockets for storing hex data les Loud audible alarm for noisy manufacturing environments
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These additional capabilities come at a price, however; the MPLAB PM3 is about $1,000 (USD), which may make it less attractive for hobbyists or companies that want to see what the PIC microcontroller is all about before making substantial investments.
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I must confess that for many years, I had the desire to come up with the perfect universal hobbyist programmer, and I have created a number of programmers, which actually worked quite well for speci c PIC microcontroller part numbers and speci c PC hosts. When these programmers were rst developed, there were fewer PIC microcontroller part numbers available, with a small fraction of them being EEPROM or Flash-based and able to be electrically reprogrammed. There are several hundred PIC microcontroller part numbers available today with many subtle variations on the ICSP programming algorithms existing, which means that each device has to have its programming algorithm and parameters speci ed uniquely and not part of a class of parts. Similarly, PCs were much less sophisticated than they are now, with parallel ports consisting of the same interface circuitry designed into the PC and having operating systems that allowed applications to read and write I/O ports. Today s PCs are much more complex and have substantial protections built in to prevent errant and malicious applications from overwriting data and hardware registers. I believe that the goal of a universal hobbyist programmer for PIC microcontrollers is really not
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