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Figure 6.28 The program counter is integrated into the stack, and both can have their data accessed by the program.
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THE MICROCHIP PIC MCU PROCESSOR ARCHITECTURE
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either the stack, the PCL registers of the processor, or a new address from the instruction or incremented after normal instruction execution. The output value is used for accessing program memory during execution and/or the con guration fuses during programming.
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Interrupts The PIC18 has some unique interrupt capabilities. Rather than having multiple interrupt vectors, each dedicated to a type of interrupt such as the PIC17, the PIC18 has the ability to specify high-priority interrupts, which are given a different address from low-priority interrupts. As well as providing a fast path for the highpriority interrupts, this feature allows splitting up of interrupts to avoid having to check F bits to determine which interrupt is active. When you look at a PIC18 device datasheet, you will see that the high-priority interrupts are at address 8, and the low-priority interrupts are at address 0x18. This may seem different from the mid-range devices, which have a single interrupt vector at address 4; the addresses are exactly the same because the PIC18 does not handle addresses in the same way as the low-end and mid-range devices. Each PIC18 instruction takes up 2 bytes, and the addresses are based on the number of bytes, not on instructions, as is the case in the low-end and mid-range architectures. This difference means that the high-priority interrupt vector is at the fth instruction after the reset vector, exactly the same as in the mid-range devices. I have pointed out this difference because the two-address increment for every PIC18 instruction affects every aspect of the architecture and any comparisons or application porting between architectures. This is something that you must be cognizant of when you are working with the chips to ensure that you do not make the mistake of jumping to an incorrect address because you were following the addressing convention of another speci c architecture instead of the one you are actually using. I nd that errors of this type are the number one mistake I make in my PIC18 programming because I am so familiar with the low-end and mid-range PIC microcontroller architectures and addressing operations.
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USING THE PIC MCU INSTRUCTION SET
In this book, I have put a lot of emphasis on understanding the PIC microcontroller s processor architecture and visualizing how application code and instructions move data through the PIC microcontroller. I do this because the PIC microcontroller s instruction set is somewhat unusual. Most people rst learn assembly language programming on a conventional Von Neumann processor, like the Motorola 6800, and when presented with the PIC microcontroller they feel like they are starting all over again. By developing a good understanding of the PIC microcontroller device, you will be able to code it quite easily. Along with being able to develop software for the PIC microcontroller, you will also be able to look for opportunities to optimize your application and simplify it using the PIC microcontroller s architectural features. To characterize a processor s instruction set, I nd that it is best to break the instructions into functional groups. The instruction sets used by the three different PIC microcontroller architectures discussed in this book can be broken up into four such groups. The rst group contains the data movement instructions, which are used to move data in and out of the processor. As I indicated earlier in the book, data movement within the PIC microcontroller always takes place through WREG, although register arithmetic instructions have the option of storing the result into WREG or back into the source register. Data processing instructions include adding, subtracting from registers, along with incrementing, decrementing, and doing bitwise operations. The arithmetic instruction group can be broken up into two subgroups, the register arithmetic (where only the contents of registers are used) and the immediate arithmetic (where an explicitly stated constant value is used for the operation). Execution change instructions make up the next functional group. These are the gotos, calls, and returns as well as conditional instruction skips. The PIC microcontroller instruction sets differ from other traditional processor instruction sets in that a jump on condition requires two instructions instead of a single explicit one. To carry out conditional jumps or other conditional operations, a skip next instruction is executed before the actual operation. Along with traditional goto and call instructions, there is the opportunity to write to the PIC microcontroller s
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