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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

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:

where F = molal feed rate D = distillate flow B = bottoms Aow A material balance on each component must also be closed, using x, y, and

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

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

The problems with this method are that adding and deleting variables are a problem especially if there are not very many free le registers available. To eliminate this problem, Microchip has come up with the CBLOCK directive that has a single parameter that indicates the start of a label equate. Each label is given an ascending address, and if any labels need more than 1 byte, a colon (:) and the number of bytes are added after the label. When the de nitions are nished, the ENDC directive is speci ed. Using the CBLOCK and ENDC directives, the variable declarations above could be implemented as

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