read barcode in asp net web application LOW-END PIC MICROCONTROLLER INSTRUCTION SET in Software

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LOW-END PIC MICROCONTROLLER INSTRUCTION SET
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if ((CallAddress & 0x400) != 0) ; Required if bsf STATUS, PA1 else bcf STATUS, PA1 endif if ((CallAddress & 0x800) != 0) ; Required if bsf STATUS, PA2 else bcf STATUS, PA2 endif call (CallAddress & 0x1FF) | ($ & 0x200) if (($ & 0x200) != 0) ; Required if bsf STATUS, PA0 else bcf STATUS, PA0 endif if (($ & 0x400) != 0) ; Required if bsf STATUS, PA1 else bcf STATUS, PA1 endif if (($ & 0x800) != 0) ; Required if bsf STATUS, PA2 else bcf STATUS, PA2 endif
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The lack of a ret e instruction should not be surprising because there are no interrupts in the low-end PIC microcontrollers. Where you should be surprised is the lack of the return instruction. This is further confused by different versions of the Microchip assembler accepting the return instruction for the low-end devices and substituting a retlw 0 instruction for it. This has caused problems for a number of people and is the reason why I tend to not return subroutine parameters in WREG because I may slip up in my low-end programming or port code from a mid-range application into a low-end PIC microcontroller and nd that it doesn t work properly. The latest versions of MPLAB and the MPASM assembler will return a warning if a return instruction has been inserted into low-end PIC microcontroller application code and will tell you that a retlw 0 instruction has been inserted in its place.
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Tables Tables suffer from the lack of an address bit 8, the same way the low-end PIC
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microcontroller call instruction does. Rather than come up with a method to create an arbitrary sized table that can be located anywhere in the low-end device s memory, I am going to recommend that the tables be placed at the start of a page and that you are restricted to 255 maximum table entries (assuming that the addwf PCL, f instruction takes up the extra available instruction).
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USING THE PIC MCU INSTRUCTION SET
The low-end PIC microcontroller table would take the form:
Table: addwf dt
PCL, w Table , 0
WREG has offset into table
where WREG was loaded before the call instruction with the offset within the table.
PROCESSOR CONTROL INSTRUCTIONS
There are no differences in the processor control instructions available to the low-end PIC microcontroller part numbers and their noninterrupt related behavior available to the mid-range.
PIC18 Instruction Set
Like the low-end PIC microcontroller architecture, much of the software written for the mid-range chips can be used on the PIC18 architecture. Differences include the change in bank register and program memory accessing. All the hardware I/O or special function registers (SFRs) in the PIC18 can be accessed directly, without the need for changing bank select bits. The multiple, enhanced index registers ease the effort in implementing arrays, data stacks, pointers, and other multibyte data structures. The PIC18 has additional instructions over the mid-range with many new capabilities that will make your application development simpler and much easier. Despite the differences in the architectures, you will nd that most applications written for the mid-range PIC microcontroller processor architecture will execute without modi cation in the PIC18. There has been a big improvement in the ef ciency of the instruction set used in the PIC18 architecture. As a superset of the mid-range architecture, there are operations that can be carried out much more ef ciently and much easier in the PIC18 than in the midrange devices. While I have noted that the standard PIC microcontroller mid-range is at least 30 percent more ef cient than other 8-bit processor architectures in executing operations at the same instruction cycle speed, the improved instruction set of the PIC18 easily doubles that value (or more). This makes the PIC18 more than twice as ef cient in terms of application instruction size and execution cycles over other 8-bit processors available in the marketplace. Coupled with the very fast (four clock cycle per) instruction clock, the PIC18 is capable of remarkably fast and powerful applications without having excessive heat dissipation or current requirements. For the remainder of this chapter, I will introduce you to the PIC18 and show what can be done to improve the ef ciency of application execution over the earlier PIC microcontroller processor architectures. To allow you to learn as much as you can, I suggest that you start up MPLAB IDE, click on Project and then Project Wizard to create the P18InsTemplt.asm project for the PIC18F2510 with the execution template below. This will allow you to quickly try out the different instructions and code snippets that are presented by entering them into the P18InsTemplt.asm le:
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