STC89LE53RC datasheet(140/165 Pages) STC

140 / 165 page

The operation is applied on the corresponding bits in each operand. The operator must be separated from the

operands by space or tab characters. For example, the following two instructions are the same:

MOV

A, # '9' AND 0FH

MOV

A, #9

The NOT operator only takes one operand. The following three MOV instructions are the same:

THREE

EQU

MINUS_THREE EQU

-3

MOV

A, # (NOT THREE) + 1

MOV

A, #MINUS_THREE

MOV

A, #11111101B

Special Operators

The sepcial operators are

SHR

shift right

SHL

shift left

HIGH

high-byte

LOW

low-byte

()

evaluate first

For example, the following two instructions are the same:

MOV

A, #8 SHL 1

MOV

A, #10H

The following two instructions are also the same:

MOV

A, #HIGH 1234H

MOV

A, #12H

Relational Operators

When a relational operator is used between two operands, the result is alwalys false (0000H) or true (FFFFH).

The operators are

equals

< >

not equals

less than

less than or equal to

greater than

greater than or equal to

Note that for each operator, two forms are acceptable (e.g., "EQ" or "="). In the following examples, all relational

tests are "true":

MOV

A, #5 = 5

MOV

A,#5 NE 4

MOV

A,# 'X' LT 'Z'

MOV

A,# 'X' >= 'X'

MOV

A,#$ > 0

MOV

A,#100 GE 50

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