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Just using these two statements will certainly make your application ef cient, but almost impossible for other people (and probably yourself) to read. By adding different types of statements, the readability of the MPASM source is improved considerably and the ease with which you develop applications will be improved as well. When you look at minimum.asm, the rst problem you will have with it is that you don t have any idea what the instructions are pointing to. Labels and de nes are added to applications that allow you to reference addresses and certain constants with text strings that should make understanding the code somewhat easier. By taking minimum.asm and adding the register name labels (from the documentation), you can improve the readability of the application considerably:
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clrf bsf clrf bcf goto end PORTB STATUS, 5 TRISB ^ 0x080 STATUS, 5 4
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The bit labels given in the documentation can also be used to further enhance the readability of the application source code:
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clrf bsf clrf bcf goto end PORTB STATUS, RP0 TRISB ^ 80 STATUS, RP0 4
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The XORing TRISB with 80 clears the most signi cant bit of the address. When MPASM starts executing, the default numbering system (or radix) is hexadecimal. This means that the 80 that is XORed with the address of TRISB is actually 128 decimal. The register and bit labels are not available automatically to the assembler; they must be loaded in from the Microchip include les (.inc). As will be discussed later in this chapter, the include les have all the labels in the documentation as well as other information required by the application. The include directive is used to copy a text le (such as the .inc le) into the source le.
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include clrf bsf clrf bcf goto end p16F84.inc PORTB STATUS, RP0 TRISB ^ 80 STATUS, RP0 4
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For this application, I have assumed that PIC16F84 is the PIC microcontroller used in the application and loaded its .inc le using the include directive.
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Labels can also be used as addresses within the application and are located in the rst column of the application. This avoids having to keep track of absolute or relative addresses. In minimum.asm, I can add the forever label to eliminate the need to count the number of instructions and explicitly put in the address to jump to.
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include clrf bsf clrf bcf forever: goto end p16F84.inc PORTB STATUS, RP0 TRISB ^ 80 STATUS, RP0 forever
In the PIC microcontroller assembler, a colon character (:) is not absolutely needed to identify a label, but it should always be used to avoid any ambiguity for either the human reader or the assembler. The label should be in the rst column to indicate that it is not an instruction or directive. When a label de nition, such as the forever line above, is encountered, the label (forever in this case) is assigned the value of the current address. Another way of doing the same thing in this case is to use the $ directive as the destination of the goto instruction. The $ directive returns the address of the current instruction.
include clrf bsf clrf bcf goto end p16F84.inc PORTB STATUS, RP0 TRISB ^ 80 STATUS, RP0 $
In this case, the goto $ instruction statement puts the PIC microcontroller processor into an endless loop. The $ can be used with arithmetic operations to jump to an address that is relative to the current one. For example, $ - 1 will place the address of the previous instruction into the source code. Labels can be used for variables that are de ned as le registers. The recommended method of doing this is to use the CBLOCK directive, which has the single parameter as the start of the register block. Following the CBLOCK and starting address statement, the variables are listed. If more than one byte is required for a variable, a colon (:) followed by the number of bytes is speci ed. Once all the variables have been included, the ENDC directive is used. The variable declaration looks like:
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