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PIC Microcontroller Families
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There are four PIC MCU families of 8-bit microcontrollers that you can choose from for your applications. The most important difference between the families is primarily due to processor architecture built into the chip the peripheral functions available on
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the chips are largely a function of the sophistication of the processor. The more capable the processor, the more likely that sophisticated peripheral functions are available in chips built using this processor.
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LOW-END PIC MCUS
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When the PIC microcontroller rst became available from General Instruments in the early 1980s, the device consisted of a very simple processor executing 12-bit wide instructions with basic I/O functions. Variable RAM in these devices consisted of a few tens of bytes. Some early PIC part numbers were able to work with external program memory, while others had built-in programmable ROM on board. The chips themselves were built using a number of manufacturing processes and were quite inef cient in terms of power utilization. Over the years, these microcontrollers were improved by redesigning them with CMOS technology, providing better program memory that can be easily programmed (or burned) in the eld, as well as additional features, and became the PIC families of microcontrollers. Despite these improvements, the original PIC microcontroller architecture became the low-end of the modern PIC MCU families. The devices do not have many of the features of the other PIC families, which makes them less attractive to work with for many applications. This is not to say the low-end devices are not useful and should not be considered when planning an application. Instead, they should be considered for speci c application niches, chosen with the following application requirements in mind:
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Simple interface functions Limited variable memory Simple digital interfaces
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The low-end PIC microcontrollers do not have a lot of program memory and cannot execute involved application code with sophisticated mathematical operations. Many devices only have program memories capable of storing 512 instructions available, with the maximum for the architecture being only 2048 (2K). This doesn t mean complex applications and code cannot be implemented, just that code with complex interface functions (and complex text interfaces) should not be implemented with low-end PIC MCUs. When the low-end PIC microcontrollers rst came out, they were given their own unique register names and conventions that differed from the mid-range devices. These variances caused some confusion for people transitioning between the parts. To help alleviate this problem, over the past few years Microchip has been changing the low-end device register names and documentation to better match the mid-ranges. This has resulted in some confusion for people who have worked with the low-end devices or who have older documentation. I recommend that you only use the latest low-end documentation and stick with the register and resource names that match the mid-range devices to simplify the effort in moving (or porting) applications between the two architectures. With these changes to the documentation, the low-end devices have become much more like the mid-range,
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although with fewer features. For this reason, I tend to call the low-end architecture a subset of the mid-range architecture. When I rst started working with PIC microcontrollers, I didn t feel that the low-end architectures were that useful, due to the limited program and variable memory, no interrupts, no advanced peripheral features, and no serial programming. This conclusion could be felt even more strongly due to the availability of the low cost mid-range parts that do not have these limitations. Microchip has kept the low-end architecture viable with the release of Flash-based products that are ideally suited for simple, digital interfacing applications. These parts are extremely low cost and can be used to replace common clocking (such as the 555 timer) and logic chips.
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