STC89LE53RC datasheet(146/165 Pages) STC

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The DB directive permits character strings (enclosed in single quotes) longer than two characters as long as they

are not part of an expression. Each character in the string is converted to the corresponding ASCII code. If a label

is used, it is assigned the address of th first byte. For example, the following statements

CSEG AT

0100H

SQUARES:

0, 1, 4, 9, 16, 25

;SQUARES OF NUMBERS 0-5

MESSAGE:

'Login:', 0

;NULL-TERMINATED CHARACTER STRING

When assembled, result in the following hexadecimal memory assignments for external code memory:

Address

Contents

0100

0101

0102

0103

0104

0105

0106

0107

0108

0109

010A

010B

010C

DW (Define Word)

The format for the DW (define word) directive is

[label:]

expression

[, expression] […]

The DW directive is the same as the DB directive except two memory locations (16 bits) are assigned for each

data item. For example, the statements

CSEG

200H

$, 'A', 1234H, 2, 'BC'

result in the following hexadecimal memory assignments:

Address

Contents

0200

0201

0202

0203

0204

0205

0206

0207

0208

0209

Program Linkage

Program linkage directives allow the separately assembled modules (files) to communicate by permitting

intermodule references and the naming of modules. In the following discussion, a "module" can be considered a

"file." (In fact, a module may encompass more than one file.)

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