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PIC Microcontroller Feature Summary
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Choosing one 8-bit PIC microcontroller part number over another for a speci c application is not as dif cult as you may think. The chips are based on four processor architectures which provide different capabilities while still requiring many of the same thinking skills and tricks required to create an application. Code development is greatly simpli ed by the use of Microchip s MPLAB IDE (integrated development environment), which can be used for all the PIC microcontroller part numbers. The input/output (I/O) pins and peripheral features are designed to easily interface with devices wired to the PIC MCU using standard interfaces or bit-banging general purpose pins. The real secret to designing PIC microcontroller applications is not to learn one part inside and out before looking at other devices, but to understand the fundamentals of programming the devices, the interfacing options available to you, and working with MPLAB IDE. By taking this approach, you will be able to work with a great many PIC MCUs with very little learning speci c to individual part numbers.
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PIC MICROCONTROLLER FEATURES AND PERIPHERALS
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In Table 2.1, I have summarized the electrical features that make up different PIC microcontrollers and can be searched on to nd the part number that best meets your application s requirements. Table 2.1 does not summarize the packaging options that are available for the PIC MCU part numbers all part numbers have multiple packages (the plastic or ceramic case that protects the chip from the elements and allows it to be attached to a printed circuit board) but this information is presented in detail later in this chapter. One parameter not included in Table 2.1 is the speci cation between commercial (standard temperature range), industrial (extended temperature range), or automotive (extreme temperature range) parts. Parts speci ed to work in one of the extended
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PIC MICROCONTROLLER FEATURE SUMMARY
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TABLE 2.1 MICROCHIP PIC MICROCONTROLLER DISTINGUISHING CHARACTERISTIC AND FEATURE LIST FEATURE OPTIONS COMMENTS
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Processor architecture
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Low-end, mid-range, PIC17, and PIC18
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The computer portion of the microcontroller that executes programs. The processor architecture is often referred to as the f amily the PIC microcontroller belongs in. Interrupt capability is a function of the processor architecture. Most new parts run at what was once considered the low voltage range. While there is emulator hardware available from Microchip for all PIC microcontroller part numbers, some have built-in debugger capabilities, which allows for low cost in circuit application debugging. The program memory contains the application software used by the PIC microcontroller and is known as nonvolatile because it is not lost when power is taken away from the PIC MCU. There are many similar PIC microcontroller part numbers in which the only distinguishing characteristic is the amount of program memory. The most popular method of programming is ICSP, which uses the same I/O pins as the MPLAB ICD debugger. Many clocking options are available for PIC microcontrollers. Selection can affect application performance, accuracy, and cost. Options available to help control the reliable operation of the application.
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Operating voltage Debugging options
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Standard parts: 4.5 to 5.5 volts; L or low voltage parts run from 2.0 to 6.0 volts MPLAB ICD built-in debugger hardware
Program memory type
Mask ROM, EPROM, Flash
Program memory size
Ranges from hundreds of instructions to millions
Programming method
Low-end parallel, in-circuit serial programming (ICSP), PIC17 parallel Watch (32.768 kHz) crystal, high speed crystal (1 MHz and above), RC oscillators, external resistor oscillators, internal oscillators, clock multiplier PLL, dual operation External, optional internal, brownout reset, watchdog timer, power up delay timer
Oscillator type
Reset operation
(Continued)
THE MICROCHIP PIC MICROCONTROLLER
TABLE 2.1 MICROCHIP PIC MICROCONTROLLER DISTINGUISHING CHARACTERISTIC AND FEATURE LIST (CONTINUED) FEATURE OPTIONS COMMENTS
File register size
From tens of bytes to thousands
File registers are the PIC microcontroller s variable memory. Register organization is speci c to processor architecture. Long term or nonvolatile variable storage. Timers can be used for software timers as well as counting/timing external events. I/O pins are available in quantities of fewer than 10 to more than 60. Analog inputs are either summing ADC or comparators. I/O pins can either be used as general purpose interfaces or devoted to speci c interface functions. Monitor and ag processors of external events. Features to allow advanced software operations.
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