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The Right PIC Microcontroller to Learn On
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Before leaving this chapter, I wanted to make a few comments about which PIC microcontroller is the right one for somebody to learn on. If you have read other books for the PIC beginner, you will see that they discuss starting out with the PIC16C54, PIC16F84(A), PIC16F684, etc.; the thing that all of them have in common is that they all focus on one part number for you to work with initially. Similarly, new developers are encouraged to work with one development environment and one set of software development tools, as well as only a single operating voltage (normally 5 V) and methods of wiring the chosen PIC microcontroller into an application. I do not believe that this is
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the appropriate method for everybody learning the PIC microcontroller, and as you work through the examples in this book and start on your own applications, you should think about whether or not these approaches are correct for you. The problems with only working with one device center around the lack of sophisticated built-in I/O peripheral functions. With the typical PIC microcontroller part number that is recommended for learning, the advanced peripherals (analog-to-digital converters, UARTs, I2C busses, etc.) are simply not present. This does not mean that the functions that these features provide are not implemented, just that they are implemented using the basic I/O pins and operating them in a manner for which they aren t designed (as the saying goes, If all you have is a hammer, everything looks like a nail ). Along with this, you will nd that the peripheral functions are multiplexed along with peripheral functions on pins that also can function as digital I/O pins (it isn t unusual to see PIC microcontroller I/O pins being usable for four different functions). Thinking of the case of analog-to-digital converter inputs, some pins are selected as analog inputs even though the ADC function is not enabled; for these parts, either the analog input is turned off or the ADC is turned on and used to measure voltages at the different pins. By learning the PIC through the use of multiple devices, you gain greater insight into how the different peripherals work and how they interact with other functions and capabilities of the basic I/O pins. If you are new to microcontrollers, electronics, and programming, then a device with multiple functions on each I/O pin will be overwhelming, and this would be the case when starting with a basic device that does not have any advanced functions on the I/O pins. The important thing to remember in this case is that you should not be using the digital I/O pins for anything other than digital I/O. If analog or other standard peripheral functions are required for the application, then you should move to a PIC microcontroller that has this function built in and learn how to work with it. While I am strongly recommending that you should only work with the MPLAB IDE, I believe that you should experiment with different languages and programmers to nd out which tools are best for you. Don t limit yourself to just assembly language; spend some time with the free versions of the high level languages to see which one you feel comfortable with. Modern PIC microcontroller compilers produce remarkably efficient code that, as a new developer, you will be hard-pressed to improve on. The question of voltage levels is one that is gaining more importance. Even with the second edition of this book, 5-V logic was standard for many products, as well as for educational kits. Today, 3.3 V is becoming the logic voltage of choice, with 5 V being somewhat of an anachronism. Along with 3.3 V becoming the new standard, for microcontrollers, 2 V (using a single lithium battery or two discharged alkaline batteries) is not that unusual. The newer PIC microcontrollers support 3.3 V, and many of them work through a range of 2.0 to 6.0 V. You should not lock yourself into 5.0 V but instead be prepared to handle voltages through a wide range and assume that you will be powered by batteries as well as an external power supply. Another aspect of the power-supply question is the voltage used for programming and the process used for burning the application onto the PIC microcontroller. The MPLAB
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