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APPENDIX G
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result, which is opposite to how the operations are carried out in low-end and mid-range PIC microcontrollers. If you are adding and subtracting to a 16-bit variable and storing the result in another variable, then basically the same code can be used, as I ve shown below. The difference between the two methods is that rather than specifying the Source destination in the addwf/subwf instructions, the w register is speci ed, and the result is stored in the destination, that is,
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and will look like this:
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movlw addwf movwf movlw addwf movwf btfsc incf HIGH 0x5678 Source + 1, w Destination + 1, f LOW 0x5678 Source, w Destination, f STATUS, C Destination + 1, f ; Add High Byte First ; Store Result in Destination ; Add Low Byte Next ; Store Result ; Is the Carry Flag Set ; Yes, Increment High Byte
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Subtraction with the result being stored somewhere else is carried out exactly the same way.
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ADDITION/SUBTRACTION OF OTHER VARIABLES
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Addition of a 16-bit variable to another 16-bit variable is similar to that of adding a constant to a 16-bit variable. If the destination is the same as one of the values, such as
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a = a + b
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the code looks like this:
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movf b + 1, w addwf a + 1, f movf b, w addwf a, f btfsc STATUS, C incf a + 1, f ; Add the High Bytes ; Add the Low Bytes ; Add the Carry to High Byte
If the destination is different from both values to be added, that is,
c = a + b
the code is changed to save the sums in the w register and then store them in c like
movf a + 1, w addwf b + 1, w ; Add the High Bytes
REUSE, RETURN, AND RECYCLE
movwf c + 1 movf a, w addwf b, w movwf c btfsc STATUS, C incf c + 1
; Add the Low Bytes
; Increment due to Carry
Subtraction is carried out in the same way, but care must be taken to ensure that the subtracting register is kept straight (something that is less of an issue with addition). If you want to do the following statement:
c = a - b
you would use the code
movf b + 1, w subwf a + 1, w movwf c + 1 movf b, w subwf a, w movwf c btfss STATUS, C decf c + 1 ; Get Value to be subtracted ; Do the High Byte ; Get the Value to be Subbed
; Look for the Carry
OTHER OPERATIONS ON CONSTANTS AND VARIABLES
Doing other operations (bitwise or whatever) on 16-bit values can use the code shown above as a base. The big difference between it and the code above is that you don t have to worry about carrying values. For example, ANDing a 16-bit variable with 0x0A5A5 would be done like
movlw 0xA5 andwf Reg + 1, f andwf Reg, f ; Get Value for ANDING ; Do the High Byte ; Do the Low Byte
And this follows on for the other types of operations (i.e., with another 16-bit variable or with a different destination). There is one difference, however, and that has to do with rotating 16-bit values. Rotating must be carried out in such a way that the carry ag is always correct for the shift. This means that the carry ag rst must be cleared (to put a 0 in the bit getting the carry ag). Next, the rst rotate should be selected in such a way that the second will have a valid carry ag (i.e., holding the value to be transferred from the rst register). For example, to shift left, use
bcf rlf rlf STATUS, C Reg, f Reg + 1, f ; Clear the Carry Flag for new bit ; Shift the Low Byte ; Shift High Byte with Low Carry
APPENDIX G
and to shift right, use
bcf rrf rrf STATUS, C Reg + 1, f Reg, f ; Clear Carry Flag for the New bit ; Shift down the High Byte ; Shift Low Byte with Valid Carry
COMPARISONS WITH 16 BIT VARIABLES
Comparisons involving 16-bit variables require that the comparison value (or register) be subtracted from the register to be checked. The results of this will then tell you what is going on with the condition. I use the same code as shown above, save the result in temporary values, and then look at the result. The subtraction code used for comparing a 16-bit variable with another 16-bit variable is
movf Reg2 + 1, w subwf Reg1 + 1, w movwf _2 movf Reg2, w subwf Reg1, w btfss STATUS, C decf _2 ; Get the High Byte of the Result ; Store in a Temporary Register ; Get the Low Byte ; Decrement High if Necessary
At the end of this series of instructions, the w register contains Reg2 - Reg1, and _2 contains Reg2HI - Reg1HI with the borrow result of Reg2 - Reg1. If the variable is to be compared against an immediate value, then the movf instruction would be replaced with movlw and the 2 bytes of the immediate value. There are six basic conditions that you can look for: equals, not equals, greater than, greater than or equal, less than, and less than or equal. Thus, to discover whether or not I have any of these conditions, I add one of the following code examples. For equals and not equals, the value in the w register is ORed with _2 to see if the result is equal to zero:
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