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Sometimes when handling data you will have to keep integers within a range. The four instructions below will make sure that the variable Temp always will be in the range of 0 to Constant.
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movlw subwf btfsc subwf Constant Temp, w STATUS, C Temp, f ; 0 <= Temp <= Constant
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Another of Dmitry Kiryashov s routines is this sequence of instructions for swapping bit pairs in a byte in ve instructions/cycles.
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; (c) 1998 by Dmitry Kirashov movwf X ; ; ; ; ; Save the Incoming Byte in a temporary register w = X = ABCDEFGH w = 0B0D0F0H X = ABCDEFGH + 0B0D0F0H
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; X = (ABCDEFGH + 0B0D0F0h) >> 1 ; w = BADCFEHG
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Setting and resetting bits based on the state of other bits is not something the PIC microcontroller seems to be able to do well naturally. By using multiple bit condition tests,
REUSE, RETURN, AND RECYCLE
the actual operations are pretty easy to implement. Note that these routines should not be used for changing I/O port values because there may be an incorrect intermediate value. If you are using this code for changing an I/O port or hardware control register bit, make sure that you read the register s contents into the w register and use the andlw and iorlw instructions to change the bit before writing the new value back to the register. The intermediate value could initiate some hardware operation that is not desired. Setting a bit by ANDing two others together is accomplished by
bsf Result btfsc BitA btfss BitB bcf Result ; ; ; ; Assume the result is True If BitA != 1 then result is False If BitB == 0 then result is False Result is False, Reset the Bit
To show how this operation could be accomplished on an I/O port bit, I have included the code
movf PORTB, w ; Store PORTB in w for AND Op n iorlw 1 << Result ; Assume the Result is True btfsc BitA ; If BitA != 1 then result is False btfss BitB ; If BitB == 0 then result is False andlw 0x0FF ^ (1 << Result) ; Result is False, Reset the Bit movwf PORTB ; Save the Result
ORing two bits together is similar to the AND operation, except that the result is expected to be false, and when either bit is set, the result is true.
bcf Result btfss BitA btfsc BitB bsf Result ; ; ; ; Assume the result is False If BitA != 0 then result is True If BitB == 0 then result is False Result is True, Set the Bit
The nal operation is the NOT. There are two ways of implementing this operation based on where the input value is relative to the output value. If they are the same (i.e., the operation is to complement a speci c bit), the code to be used is simply
movlw 1 << BitNumber xorwf BitRegister, f ; Complement Speci c Bit for NOT
If the bit is in another register, then the value stored is the complement of it:
bcf Result btfss Bit bsf Result ; Assume that the Input Bit is Set ; - If it is Set, then Result Correct ; Input Bit Reset, Set the Result
APPENDIX G
Mykemacs.inc
I want to introduce you some basic programming and I/O functions for low-end and midrange PIC microcontrollers. When I rst started writing this, I was trying to gure out how to best present them so that they could be used easily without you having to gure out how to modify code that is cut and pasted into your application. The solution I came up with is to provide macros for these functions. The macros listed below are examples of quite advanced macros. Along with providing different methods of interfacing, I also use the expected PIC microcontroller s clock speed to calculate delays within the macros. For the most part, they can be used without modi cation, but you should read through the accompanying text to make sure that you are aware of any issues with the macros on different devices. When this code was written, it was designed for low-end and mid-range PIC microcontrollers. You will nd that for initializing interfaces, I have used the mid-range TRIS registers instead of the common tris instructions. This was done because of the ease with which speci c pins can access speci c tris bits using the bsf and bcf instructions. For low-end PIC microcontrollers, you will have to come up with your own TRIS register values based on the I/O pins you are going to access. All these macros, including the structured programming macros I presented earlier in this book, are bundled up together in what I have immodestly called mykemacs.inc. This le is located in the C:\PICDwnLd\Macros\mykemacs subdirectory of your PC s PIC Microcontroller directory. To use mykemacs.inc in your applications, copy the le into your PC s C:\Program Files\Microchip\MPASM Suite folder. When mykemacs.inc is to be used in your application, include the le using the statement
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