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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STC89C53RC датащи(PDF) 139 Page - STCmicro Technology Co,.Ltd |
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STC89C53RC датащи(HTML) 139 Page - STCmicro Technology Co,.Ltd |
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139 / 165 page  Number Bases The base for numeric constants is indicated in the usual way for Intel microprocessors. Constants must be followed with "B" for binary, "O" or "Q" for octal, "D" or nothing for decimal, or "H" for hexadecimal. For example, the following instructions are the same: MOV A , #15H MOV A , #1111B MOV A , #0FH MOV A , #17Q MOV A , #15D Note that a digit must be the first character for hexadecimal constants in order to differentiate them from labels (i.e., "0A5H" not "A5H"). Charater Strings Strings using one or two characters may be used as operands in expressions. The ASCII codes are converted to the binary equivalent by the assembler. Character constants are enclosed in single quotes ('). Some examples follow. CJNE A , # 'Q', AGAIN SUBB A , # '0' ;CONVERT ASCII DIGIT TO BINARY DIGIT MOV DPTR, # 'AB' MOV DPTR, #4142H ;SAME AS ABOVE Arithmetic Operators The arithmetic operators are + addition - subtraction * multiplication / division MOD modulo (remainder after division) For example, the following two instructions are same: MOV A, 10 +10H MOV A, #1AH The following two instructions are also the same: MOV A, #25 MOD 7 MOV A, #4 Since the MOD operator could be confused with a symbol, it must be seperated from its operands by at least one space or tab character, or the operands must be enclosed in parentheses. The same applies for the other operators composed of letters. Logical Operators The logical operators are OR logical OR AND logical AND XOR logical Exclusive OR NOT logical NOT (complement) 139 |
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