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bsf DlayCount, Bit1 bsf DlayCount, Bit2 decfsz DlayCount, f goto $ - 1
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In this case, the delay is 3 times the nal value in DlayCount plus 1. As a formula, the instruction delay is
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DlayMacroLoopDelay = (DlayCount * 3) + (#DlayCount Bits Set - 1)
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This probably seems a bit cumbersome to work with, but the macro takes care of the calculation for you. After the loop has nished, the code will check for any left-over instruction cycles and insert goto $ + 1 or nop instructions as required so that the DlayMacro executes for exactly the speci ed number of instruction cycles. When using this macro, you will have to declare DlayCount and make sure that it is accessible from within whatever register banks are active when the macro is invoked and that it is cleared before its rst use. On exit from the DlayMacro code, DlayCount will always be zero. To ensure that DlayCount is always zero, never change its value. You might be surprised to see that there is an initial check for the DlayMacro loop so that it only executes if the number of cycles to delay is greater than ve. The reason for this is that a combination of goto $ + 1 and nop instructions can be implemented more ef ciently than the delay loop. The macro will produce the most ef cient code that it can. When you look at this code, you might be wondering just how ef cient the code is. By explicitly testing the value for a speci c bit value and putting it into the delay, you might feel like I m not being that ef cient, especially in the case of making the loop
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movlw InitialValue movwf DlayCount decfsz DlayCount, f goto $ - 1 goto $ + 1 nop ; Delay = InitialValue * 3 + 1
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which has a worst-case size of six instructions (the DlayMacro has a worst-case size of 12 instructions). The only comment I can make to this is DlayMacro does not change the w register, and you will nd that for many cases DlayMacro will end up producing a comparable number of instructions. For example, invoking the macro
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will produce the code
bsf DlayCount, 5 bsf DlayCount, 0 decfsz DlayCount, f goto $ - 1
which is comparable in size with what the other code will do but does not change the w register. This feature of not changing the w register will be useful in the following example code. In the worst case, the DlayMacro will produce 12 instructions (to the other method s six). This happens in only one instance, and you will nd that for most instruction cycle delays this macro produces code that is within the four to six instructions of the other case.
APPENDIX G
LCD INTERFACES
To simplify the work required for adding LCDs to your applications, I wanted to create a series of four macros that would allow you to interface with LCDs in either low-end or mid-range PIC microcontrollers using one of four subroutines. By using a consistent interface, the same software can be used for a variety of different situations without requiring that the application code be changed the vision was that just a new macro would needed to be invoked to access the LCD. The four LCD subroutines are LCDPORTInit Used in mid-range devices to de ne the I/O ports that interface to the LCD LCDInit Put the LCD into 2 line mode LCDChar Send an ASCII character to the LCD LCDIns Send an LCD instruction Along with these subroutines, each macro creates a Dlay5 subroutine that delays execution for 5 ms for LCD reset operations. In each LCD access type macro, I create a 160- s delay code that is inserted in line and based on the DlayMacro and does not change the value of any registers. For the most part, the interfaces are direct to the LCDs, but there are some points that you should be aware of that I point out in the text below. The rst macro is LCD8, which provides a basic interface to the LCD with worstcase startup delays. To invoke it, the statement
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