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companies have been able to attract. There are many people I would like to thank for answering my questions and helping me to understand the PIC microcontroller from different perspectives and while I am reluctant to try and name everyone that has helped me over the years, I would like to recognize Karim Osman, John Scharkov, and Jules Varenikic for the time they have spent with me talking about PIC microcontroller and robotics projects and helping me with creating them. To my children, Joel, Elliot, Marya, and Talitha (our family is continually growing), thank you for recognizing the notes, parts, and projects left lying around the house are not to be touched and when I m mumbling about strange things, I m probably not listening to how your day went. The four of you would be absolutely perfect if you would just nish your homework before it was due. This book is something that you should be proud of as well. Finally, the biggest thank you has to go to my aptly named wife, Patience. Thank you for letting me spend all those hours in front of my PC and then spending a similar number of hours helping me out by keying in the never ending pages of scrawl that was written in airport bars, hotel rooms, and cramped airline seats. Thank you for putting up with the incessant FedEx, Purolator, and UPS couriers, organizing the sale of the old house and being part of the creation of a completely new one. Writing something like this book is an unbelievably arduous task and it never would have been possible without your love and support. Let s go and enjoy our new home. Myke Predko Toronto, Canada August 2007
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The primary role of the Microchip PIC and other embedded microcontrollers is to provide inexpensive, programmable logic control and interfacing to external devices. This means they typically are not required to provide highly complex functions they can t replace the Opteron processor in your ISP s server. They are well suited to monitoring a variety of inputs, including digital signals, button presses, and analog inputs, and responding to them using the preprogrammed instructions that are executed by the built-in computer processor. An embedded microcontroller can respond to these inputs with a wide variety of outputs that are appropriate for different devices. These capabilities are available to you at a very reasonable cost without a lot of effort. This chapter will introduce you to the functions and features that you should look for when choosing a microcontroller for a speci c target application. While keeping the information as general as possible, I have put in pointers to speci c PIC MCU features to help you understand what makes the PIC family of microcontrollers unique and which applications they are best suited for. You will probably nd it useful to return to this chapter as you work through the book if a speci c feature or aspect of the design of the PIC microcontrollers seems strange or illogical. There is probably a reason for the way something was done and if you can fully understand what it is doing, you will be best able to take advantage of it in your own applications.
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Microcontroller Types
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If you were to look at different manufacturer s products, you would probably be bewildered at the number of different devices that are out there and all their features and capabilities. I nd it useful to think of the microcontroller marketplace having the three major subheadings:
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Embedded (self-contained) microcontrollers Microcontrollers with external support Digital signal processors
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There is quite a wide range of embedded (self-contained) devices available. An embedded microcontroller has all the necessary resources clocking, reset, input, and output (referred to as I/O) available in a very low cost chip. In your application circuit, you don t have to provide much more than power (and this can be as simple as a couple of AA cells). The software for the computer processor built into the microcontroller is stored in nonvolatile (always available) memory that is also built into the chip. If you were to look at hobbyist and relatively simple electronic products designed in the 1970s and 1980s, you would discover a number of standard chips such as the 555 timer chip, whereas if you were to look at more modern designs, you would discover that they are based almost entirely on embedded microcontrollers. Embedded microcontrollers have become the new standard for these applications. When you look at some of the more powerful microcontrollers, you might be confused as to the difference between them and microprocessors. There are a number of chips that are called microcontrollers (with typically 32-bit data and address paths) that require external memory and interface circuitry added to them so they can be used in applications. These chips are typically called microcontrollers because they have some of the built-in features of the embedded microcontrollers, such as a clock generator or serial interface, or because they have built-in interface circuitry to speci c types of memory. Microcontrollers tend to require support circuitry for clocking and can have a very wide range of external interface and memory devices wired to them. Digital signal processors (DSPs) are essentially very powerful calculators that execute a predetermined set of mathematical operations on incoming data. They may have built-in memory and interfaces, like the embedded microcontroller, or they may require a substantial amount of external circuitry. DSPs do not have the ability to ef ciently execute conditionally; they are designed to run through the calculations needed for processing the formula needed to process an analog signal very quickly instead of responding to changing inputs. These formulas are developed from digital control theory and can require a lot of effort to develop for speci c applications. There are DSPs that are completely self-contained, like an embedded microcontroller, or they may require external support chips. If you were to look at the microcontroller applications contained within your PC, you would nd that the embedded MCUs are used for relatively simple applications such as controlling the circuitry in the mouse. The disc drives use the more powerful microcontrollers, which can access large amounts of memory for data caching as well as have interfaces to the disc drive motors and read/write circuitry. The sound input and output probably pass through DSPs to provide tone equalization or break down speech input. If you look at other electronic devices around your house (such as your TV and stereo), you can probably guess which type of microcontroller is used for the different functions.
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