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i EQU 0x00C j EQU 0x00D k EQU 0x00F : ; Note, j is Sixteen Bits in Size
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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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CBLOCK 0x00C i, j:2, k ENDC ; De ne the PIC16F84 File Register Start
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This is obviously much simpler than the previous method (i.e., it requires less thinking), and it does not require you to change multiple values or specify a placeholder if one address is deleted from the list. What I don t like about CBLOCK is that speci c addresses cannot be speci ed within it. For most variables, this is not a problem, but as I will indicate elsewhere in this book, I tend to put variable arrays on power of 2 byte boundaries to take advantage of the PIC microcontroller s bit set/reset instructions to keep the index within the correct range. To make sure that I don t have a problem, I will specify an equate for the variable array speci cally and ensure that it does not con ict with the variables de ned in the CBLOCK. The last type of data to de ne in the PIC microcontroller is the bit. If you look through the Microchip MPLAB assembler documentation, you will discover that there are no bit data types built in. This is not a signi cant problem if you are willing to use the #de ne directive to create a de ne label that includes the register and bit together.
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SUBROUTINES WITH PARAMETER PASSING
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For example, you could de ne the STATUS register s zero ag as
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#DEFINE zero ag STATUS, Z
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A de ne is like an equate except where the equate associates a constant to the label, a de ne associates a string to the label. For the zero ag de ne, if it were used in the code
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movf TMR0, f btfss zero ag goto $ - 2 ; Wait for TMR0 to Over ow
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in the btfss instruction, the string STATUS, Z would replace zero ag, as is shown below when the application was assembled:
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movf TMR0, f btfss STATUS, Z goto $ - 2 ; Wait for TMR0 to Over ow
De ning bits like this is a very effective method of putting labels to bits. Using this method, you no longer have to remember the register and bit number of a ag. This can be particularly useful when you have a number of bits de ned in a register (or multiple registers). Instead of remembering the register and bit numbers for a speci c ag, all you have to remember is the de ne label. Using the bit de ne with the bit instructions of the PIC microcontroller allows you to work with single-bit variables in your application.
Subroutines with Parameter Passing
For subroutines to work effectively, there must be the ability to pass data (known as parameters) from the caller to the subroutine. There are three ways to pass parameters in the PIC microcontroller, each with their own advantages and potential problems. The rst is to use global variables unique to each function, the second is to create a set of variables that are shared between the functions, and the third is to implement a data stack. Most high-performance computer systems have a stack for storing parameters (as well as return addresses), but this feature is not built into the low-end and mid-range PIC microcontrollers. In this section I want to introduce you to each of the three methods and show how they can be implemented in the PIC microcontroller. In most modern structured high level languages, parameters are passed to subroutines as if they were parameters to a mathematical function. One value (or parameter) is returned. An example subroutine (or function) that has data passed to it would look like
A = subroutine(parm1, parm2);
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