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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In the low-end architecture, it would be:
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bsf movf tris _trisb, 3 _trisb, w PORTB ; ; Convert bit 4 to input Update the I/O pin
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Both instruction sequences take the same amount of instructions and cycles.
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Indexed addressing
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Indexed addressing in the low-end PIC microcontroller architecture works in exactly the same way as in the mid-range architecture, but there are two things that you should always be cognizant of. The rst is to remember that the maximum size of any array variable is 16 bytes, and the second is that the FSR can never equal zero. Both of these characteristics are something that you will have to keep in the back of your mind when working with the architecture. The 16-byte maximum array size is important to remember because if you go beyond this limit, you are going to overwrite the hardware registers in the next bank. This is another programming problem that may turn up and get you some time after you have written and released the application. It will be very dif cult to nd and resolve. To avoid this issue, I suggest that you always monitor bit 4 of the FSR because when this bit changes state, you know you have gone over the 16 address limit for the array. For example, if you have a 16-byte LIFO buffer (stack), you may choose to ignore any data pushes after the 16 bytes are lled up:
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; Push the byte in StackData onto stack ; Pointer to the next position in the stack ; ; ; ; ; Bank 1 used for stack Return Indicating unable to add to stack Save new stack top Get data to push Return with no error
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DataPush: incf StackTop, w movwf FSR btfss FSR, 4 retlw -1 movwf StackTop movf StackData, w movwf INDF retlw 0
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Similarly, a data pop could be accomplished by:
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DataPop: movf movwf btfss retlw movf movwf decf retlw ; Pop byte from stack and put in StackData ; Get Stack Top Register ; ; ; ; If Bit 4 Clear, then Stack is Empty Get the Stack Data Point to previous value in the stack Return with no error
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StackTop FSR FSR, 4 -1 INDF, w StackData StackTop, f 0
Recognizing that bit 4 changes when the 16-byte array is full is a trick that can be used in both the low-end and the other PIC microcontroller architectures to indicate the
USING THE PIC MCU INSTRUCTION SET
end of an array. It can also be used to implement circular buffers and avoid the need to compare to the end of the array before rolling over. To understand this, consider the traditional 16-byte circular buffer pointer increment, which can be modeled in C as:
BufferIndex++; // Increment buffer pointer if (BufferIndex >= (BufferStart + 16)) // If past end, roll over BufferIndex = BufferStart;
In PIC microcontroller assembler, this code would be:
incf movlw subwf movlw btfss movwf BufferIndex, f BufferStart + 16 BufferIndex, w BufferStart STATUS, Z BufferIndex ; ; Increment the Buffer Pointer If past end, roll over
But if you had the array in bank 2 (bit 4 of FSR should always be reset), the code becomes:
incf bcf BufferIndex, f BufferIndex, 4 ; Increment the Buffer Pointer ; Keep the Buffer Pointer within Bank 2
DATA PROCESSING INSTRUCTIONS
Arithmetic code written for a speci c PIC microcontroller architecture is usually very portable to the other PIC microcontroller architectures. For example, moving code between the mid-range and the low-end is quite easy to do except for the lack of the literal addition and subtraction instructions. Instead of executing a simple addlw Constant instruction, you will have to execute:
movwf movlw addwf TempReg Constant TempReg, w ; ; ; Save the Contents of WREG Load Accumulator with Original WREG Value added to the Constant
The loss of the immediate subtraction (sublw Constant) operation is a bit more complex, because there is a de nite order of operations with the contents of w subtracted from the constant, so a constant value will have to be put into a temporary register. Code for doing this could be:
movwf movlw xorwf xorwf xorwf subwf TempReg Constant TempReg, TempReg, TempReg, TempReg, ; f w f w ; Save the Contents of w Swap w and TempReg Constants
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