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one of these strings is encountered, it is loaded into a table along with the current program counter value for when it is referenced elsewhere in the application. Labels in MPLAB s assembler can have a colon (:) optionally put on the end of the string. To avoid any potential confusion regarding whether or not the label is to be replaced with its address or is a de ne or macro, I recommend putting the colon after it. Using the example above, a Loop label can be added to make the code a bit more portable:
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Loop: btfsc Button, Down goto Loop ; Address = Loop ; Address = Loop + 1
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The disadvantage of this method is that there can only be one Loop (and Skip) put into an application. Program memory labels are really best suited for cases where they can be more global in scope. For example, an application really should only have one main Loop, and that is where this label should be used. Personally, I always like to use the labels Loop, Skip, and End in my applications. To allow their use, I will usually preface them with something like the acronym of the current subroutine s name. For example, if the code was in the subroutine GetButton, I would change it to
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GB_Loop: btfsc Button, Down goto GB_Loop: ; Address = Loop ; Address = Loop + 1
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Instead of using labels in program memory for simple loops, I prefer using the $ directive, which returns the current address of the program counter as an integer constant and can be manipulated to point to the correct address. Going back to the original code for the button poll snippet, the $ directive eliminates the need for a label altogether:
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btfsc Button, Down goto $ - 1 ; Wait for Button to be Pressed
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You do not have to expend the effort trying to come up with a unique label (which can start becoming hard in a complex application), and as you get more comfortable with the directive, you will see its what is happening faster than if a label were used. The problem with using the $ directive is that it can be dif cult to count out the offset to the current instruction (either positive or negative). To avoid making mistakes in counting, the $ should be done only in short sections of code, such as the one above, because the destination offset to $ can be found. Also, beware of using the $ directive in large sections of code that has instructions added or deleted between the destination and the goto instruction. The best way to avoid this is to use the $ only in situations such as the one above, where code will not be added between the goto and the destination. If you have worked with assemblers for other processors (Von Neumann), chances are that you have had to request memory where variables were going to be placed. This
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operation was a result of variable memory being in the same memory space as program memory. This is not a requirement of the PIC microcontroller in which the register space (where variables are located) is separate from the program memory space. To allocate a variable in the PIC microcontroller, you have to specify the references to a label to a le register address. In the rst edition I speci ed that this was done by nding the rst le register in the processor and then starting a list of equates from there. As discussed elsewhere, an equate is a directive that assigns a label a speci c constant value. Every time the label is encountered, the constant that is associated with it is used. Program memory labels can be thought of as equates that have been given the current value of the program counter. For the PIC16F84, variable equate declarations for an application could look like
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