read barcode in asp net web application Value = ((delay * frequency/4)/5) + 256 in Software

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Value = ((delay * frequency/4)/5) + 256
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The + 256 in the formula increments the high byte so that the value stored into the low byte will execute along with the number of times the high byte has to be decremented with the low byte set to zero (which causes the code to loop 256 times).
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For the example of a 5-ms delay in a 10-MHz PIC microcontroller, Value is calculated to be
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Value = = = = = = ((delay * frequency / 4) / 5) + 256 ((5 msec * 10 MHz / 4) / 5) + 256 (12,500 / 5) + 256 2,500 + 256 2,756 0x0AC4
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For this method, a maximum value of 65,505 (0xFFFF) can be calculated for Value, but I prefer stopping at 50,256 (0xC450), which gives a 250,000-instruction-cycle delay, which can be built on by an outside loop. For example, in the 10-MHz PIC microcontroller, to get a 3-second delay, I would rst calculate the delay of 250,000 instruction cycles, which is
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Delay = Instruction Cycles * 4 / frequency = 250,000 * 4 / 10 MHz = 0.1 Seconds
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To get a 3-second delay, this 250,000-instruction-cycle delay would have to execute 30 times. Loading a register with the value of 30 and using the PIC microcontroller s decfsz instruction would accomplish this:
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movlw 30 ; Load the Outside Loop movwf Outside OuterLoop: movlw LOW 0x0C450 ; Inside 250,000 instruction Delay movwf Dlay movlw HIGH 0x0C450 movwf Dlay + 1 Loop: decf Dlay, f btfsc STATUS, Z decfsz Dlay + 1, f goto Loop decfsz Outside ; Repeat 30x for a 3 Second Delay goto OuterLoop
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You might notice that each time OuterLoop is executed, four extra cycles to load the Dlay variable are required and three extra cycles to decrement Outside and jump back to OuterLoop are required for a total of seven each time through the loop. The actual number of cycles required for this 3-second delay is
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Total Cycles = (29 * 250,000) + (29 * 7) + 2 = 7,250,000 + 203 + 2 = 7,250,205
PATCH SPACE
The nal two instructions added to the total cycles are the two instructions required to load Outside with 31. For a true 3-second delay, a total of 7.5 million instruction cycles is required, but in the preceding code, an extra 205 instruction cycles is added. If you are thinking of changing the Loop delay value to better match the desired number or instructions, consider what the error of these 205 instruction cycles is over 3 seconds:
Total Error = 205 / 7,500,000 * 100 percent = 0.002733 percent = 27.33 ppm
With this low error level, I would recommend that any extra cycles in large delays such as this be ignored. Even in the case where the timer is used, the error is quite slight and approaches the tolerance of the PIC microcontroller s clock.
Patch Space
Patch code is instruction space left in the program memory of a computer system to allow changes to be added to an application without having to rebuild it. Using patch code, changes would be made locally to a processor s program memory to allow the developer to try different things before going through the chore of changing the source, rebuilding it, and then loading it into the system to try again. When I was rst taught assembly-language programming, I was always told to leave patch space in my applications. This space would be used to add code to help x applications by providing space in which updated code that corrected the problem could be added. Using patch space was something I never did very well. I always found that I never accurately documented the changes I had made, and thus the entire debug process was slower than if I simply tried to gure out what was wrong and changed the source code directly. The reasons for providing and using patch space are
1 Application rebuild and reprogramming is a long and tedious process. 2 Application memory is usually RAM and can be changed easily in a debugger.
Both these arguments are largely false for the PIC microcontroller. Using tools such as MPLAB IDE, changes to an application source can be done in literally seconds. Programming using an ICD application can be accomplished within a minute or so. When I rst learned assembly-language programming (for the Motorola 6800), a source-code change was made and reassembled on a main frame, downloaded to a minicomputer, downloaded onto a cassette tape, and then downloaded into the 6800 computer system. This was very complex and presented a lot of opportunities for problems compared with using MPLAB IDE with a Microchip programmer for developing software and programming PIC microcontroller devices.
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