read barcode in asp net web application In PIC microcontroller assembly language code, this is in Software

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In PIC microcontroller assembly language code, this is
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movf addwf movwf Parm1, w Parm2, w Destination
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If it s required, the movf and addwf instructions can be changed to movlw or addlw, respectively, if either parameter is a constant. Subtraction in the PIC microcontroller follows a similar set of instructions, but because of the way the subtraction operation works, the subtracted value must be loaded rst into the accumulator. For example, for the high level language statement
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Destination = Parm1 Parm2
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the sequence of operations is
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1 Load the w register with the second parameter (which is the value to be taken away
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from the rst).
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2 Subtract the contents of the w register from the rst parameter and store the result
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in the w register.
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3 Store the contents of the w register in the destination.
In PIC microcontroller assembly code, this is
movf subwf movwf Parm2, w Parm1, w Destination
As with the addition operation, the movf and subwf instructions can be replaced with movlw or sublw, respectively, if either Parm1 or Parm2 is a constant. The PIC microcontroller s instructions contrasts with those of the 8051 and other microcontroller architectures, in which the subtract instruction takes away the parameter value from the contents of the accumulator. As I have indicated elsewhere, the PIC microcontroller subtract instruction actually works as
PIC microcontroller subtract = parameter w = parameter + (w ^ 0x0FF) +1
This operation affects the zero, carry, and digit carry STATUS register ags. In most applications, it is how the carry ag is affected that is of the most importance. This ag will be set if the result is equal to or greater than zero. This is in contrast to how the carry and borrow ags work in most processors. I have described the carry ag after a subtract operation as a positive ag. If the carry ag is set after a subtract operation, then a borrow of the next signi cant byte is not required. It also means that the result is negative if the carry ag is reset. This can be seen in more detail by evaluating the subtract instruction sequence for
Result A B
which is
movlw B sublw A movwf Result ; Assume A and B are Constants
By starting with A equals to 1, different values of B can be used with this sequence to show how the carry ag is set after subtract instructions. Table 8.1 shows the result, carry, and zero ags after the snippet above. I did not include the digit carry (DC) ag in the table because it will be the same as carry for this example. In subtraction of more complex numbers (i.e., two-digit hex),
SUBTRACTION, COMPARING AND NEGATION
TABLE 8.1 SUBTRACTION CARRY AND ZERO FLAG RESULTS A B RESULT CARRY ZERO
1 1 1
0 1 2
1 0 0x0FF( 1)
1 1 0
0 1 0
the DC ag becomes dif cult to work with, and speci c examples for its use (such as the ASCII-to-nybble conversion routines) have to be designed. When you are rst learning how to program in assembly language, you may want to convert high level language statements into assembly language using formulas or basic guides. When you look at subtraction for comparing, the code seems very complex. In actuality, using the PIC microcontroller subtract instruction isn t that complex, and the instruction sequence
movf subwf btfsc goto Parm1, w/movlw Parm1 Parm2, w/sublw Parm2 status, C label
can be used each time the statement
if (A Cond B) then go to label
is required, where Cond is one of the values speci ed in Table 8.2. By selecting a STATUS ag (carry on zero) to test, the execution of the goto instruction can be speci ed, providing you with a simple way of implementing the conditional jumps using the code listed in Table 8.3.
TABLE 8.2 CONDITION
if CONDITION DEFINITIONS OPERATION
== != > >= < <=
Jump if equal Jump if not equal Jump if FIRST is greater than the second Jump if FIRST is greater than or equal to the second Jump if FIRST is less than the second Jump if FIRST is less than or equal to the second
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TABLE 8.3 JUMP if
CODE EXAMPLES TO BRANCH ON A SPECIFIC CONDITION CONDITION TO CHECK CODE
A == B
A B = 0
movf A, w/movlw A subwf B, w/sublw B btfsc STATUS, Z goto Label ; Jump if Z = 1 movf A, w/movlw A subwf B, w/sublw B btfss STATUS, Z goto Label ; Jump if Z = 0 movf B, w/movlw A subwf B, w/sublw B btfss STATUS, C goto Label ; Jump if C = 0 movf B, w/movlw B subwf A, w/sublw B btfsc STATUS, C goto Label ; Jump if C = 1 movf B, w/movlw B subwf A, w/sublw A btfss STATUS, C goto Label ; Jump if C = 0 movf A, w/movlw A subwf B, w/movlw B btfsc STATUS, C goto Label ; Jump if C = 1
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