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It is amazing that, in a tiny plastic package, there is a chip that can perform basic input and output functions, with a full computer processor along with memory storing the full application code and variable data areas built on it as well. (In the next chapter, you will get an idea of what tiny means when the different PIC microcontroller chip packages are described.) The microcontroller s computer processor has essentially all the capabilities of the processor in your desktop PC, although it cannot handle as much or as large data as the PC. The microcontroller s processor executes a series of basic instructions that make up the application software, which controls the circuitry of the application. When a computer processor executes each individual program instruction, it is reading a set of bits from program memory and decoding them to carry out speci c functions. Each instruction bit set carries out a different function in the processor. A collection of instructions is known as a program. The program instructions are stored in memory at incrementing addresses and are referenced using a program counter to pull them out sequentially. After each instruction is executed, the program counter is incremented to point to the next instruction in program memory. There are four types of instructions:
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Data movement Data processing Execution change Processor control
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The data movement instructions move data or constants to and from processor registers, variable memory and program memory (which in some processors are the same thing), and peripheral I/O ports. There can be many types of data movement instructions
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based on the processor architecture, number of internal addressing modes, and the organization of the I/O ports. The ve basic addressing modes (which are available in the PIC microcontroller and will be explained in greater detail in later chapters) move data to or from the registers or program memory. If you are familiar with the Intel processors in PCs, you will know that there are two memory areas: data and registers. The data area stores program instructions and variable data, while the register area is designed to be used for I/O registers. The addressing modes available to a processor are designed to ef ciently transfer data between the different memory locations within the computer system. In the PIC microcontroller s processor (and other microcontrollers that use Harvard-architected processors) there are also two memory areas, but they are somewhat different from that of a PC and consist of program memory and registers. The program memory is loaded exclusively with the program instructions and, except in certain circumstances, cannot be accessed by the processor. The registers consist of the processor and I/O function registers along with the microcontroller s variable data (which are called file registers in the PIC microcontroller). The five addressing modes available in the PIC MCU allow data to be transferred between registers only. They are:
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Immediate (or literal) values stored in the accumulator register Register contents stored in the accumulator register Indexed address register contents stored in the accumulator register Accumulator register contents stored in a register Accumulator register contents stored in an indexed address register
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These ve addressing modes are very basic and when you research other processor architectures, you will nd that many devices can have more than a dozen ways of accessing data within the memory spaces. The ve methods above are a good base for a processor and can provide virtually any function that is required of an application. The most signi cant missing addressing mode is the ability to access data in the program counter stack. This addressing mode, along with the other ve, is available in the highend PIC microcontroller chips. The data processing instructions are the arithmetic and bitwise data manipulation operations available in the processor s arithmetic/logic unit. A typical processor will have the following data processing instructions:
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