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(1 << 4) | (1 << 2) | (1 << 1) = 16 | 4 |2 = 22 = 0x016 2 Calculate the inverse (XOR with 0x0FF): 0x0FF ^ 0x016 = 0x0E9 3 Put the value into the andlw instruction: andlw 0x0E9
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If you go through the manual process, you can see that there are more than seven opportunities for you to calculate constant values incorrectly or copy down the wrong value. Avoiding these manual calculations with their inherent opportunities for error is
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TABLE 10.1 OPERATOR
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OPERATORS AVAILABLE TO THE ASSEMBLER CALCULATOR DESCRIPTION COMMENTS
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+ * / % << >> & | ^ ~ LOW HIGH $
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Addition Subtraction/negation Multiplication Division Modulus Shift left Shift right Bitwise AND Bitwise OR Bitwise XOR Complement Low 8 bits of a constant value High 8 bits of a 16-bit constant value Current address Return remainder from divide operation Shift the rst parameter to the left by second parameter number of bits Shift the rst parameter to the right by second parameter number of bits AND together the parameter s bits OR together the parameter s bits XOR together the parameter s bits XOR the parameter with 0xFF to get the complemented or inverted value AND the parameter with 0xFF AND the parameter with 0xFF00 and then shift right 8 bits Current address of the instruction If no rst parameter, then negation
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what I meant when I said the assembly calculator is easier and less prone to mistakes. Table 10.1 lists the calculator s arithmetic operators. All the operators have two parameters, except for when negates a value or the complement ( ~ ) operator, which only have one parameter. In the clear bits example, I could have used the equation format
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andlw ~((1 << 4) | (1 << 2) | (1 << 1))
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instead of adding the 0x0FF ^ characters in the preceding instruction. For 16-bit values, you can use the low and high assembler directives. For example, if you wanted to jump to a speci c address in another page, you could use the code
movlw movwf movlw movwf HIGH Label PCLATH LOW Label PCL ; Label is the ; Destination
THE ASSEMBLER CALCULATOR
which is the same as
movlw movwf movlw movwf ((label && 0x0FF00) >> 8) PCLATH LABEL && 0x0FF PCL
In this example, the function of the rst four instructions (which use HIGH and LOW) is much clearer to somebody reading the code than the second four instructions, which require the reader to evaluate what the arithmetic operations are doing. As has been discussed earlier in this book, the $ operator returns the current program counter, which is a 16-bit value that can be manipulated using the assembler calculator s operators as if it were a constant. Along with the arithmetic operations, parentheses (the ( and ) characters) can be used in the expressions to make sure that the operation is executed in the correct order. In the preceding examples I have used parentheses to make sure that the correct order of operations takes place for these instructions. Variables that are only used in assembly can be declared using the format
variable label [ = constant][,...]
These variables are 32 bits in size and can be set to any value using the operators listed above and employing the = operator to make an assignment statement such as
LABEL1 = LABEL1 * 2
It is important to remember that the label is not an application variable (i.e., it cannot be modi ed by the PIC microcontroller as it is running), and when it is assigned a new value, it must be in the rst column of the assembly-language source. When it is being read in another statement, it can appear in any column (except for the rst) in the line. Taking a cue from C, assembler variable assignment statements can be simpli ed if the destination is one of the source parameters. These operations can be confusing to use and read unless you are familiar with C. Table 10.2 lists the combined assignment statements. The assembler calculator also can do comparisons between two parameters using the operators listed in Table 10.3. If the comparison is true, a 1 is returned; otherwise, a 0 is returned. The comparison operators are required for the conditional assembly operations presented in the next section. These comparisons can be compounded with || and &&, which are the logical OR and logical AND operators, respectively. || returns 1 if either of its two parameters are not equal to 0. && returns a 1 if both parameters are equal to 0. This operation brings up an important point: In the assembler calculator, a true condition is any nonzero value. The variable A, after executing
A = 7 && 5
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