STC89LE53RC datasheet(139/165 Pages) STC

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

logical OR

AND

logical AND

XOR

logical Exclusive OR

NOT

logical NOT (complement)

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