UM0144 datasheet(13/92 Pages) STMICROELECTRONICS

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ST7 Assembler Linker

3 ST7 Assembler

UM0144

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ST7 Assembler

3.1

Overview

The ST7 Assembler program is a cross-assembler, meaning that it produces code for a target

machine—an ST7 microprocessor—which is different from the host machine.

The assembler turns your source code files into relocatable object modules ready for linking.

During the process, it checks for many different types of errors. These errors are recorded in an

ASCII file called cbe.err. (Note that the linker also writes to this file.) Error messages are

explained in on page 78.

To produce code ready for execution, you must run the assembler (ASM), the linker (LYN), and

the object code formatter (OBSEND).

3.2

Source files

Source program code is written in the ST7 Assembler language and is saved in an ASCII text

file named source file. A source file has the extension .asm. It is made up of lines, each of

which is terminated by a new line character.

For a complete reference to the ST7 Assembler language, refer to the

ST7 Programming

Manual.

3.3

Assembly source code format

The first line of an assembly source code file is reserved for specifying the *.tab file for the

target processor. You cannot put other instructions or comments in this line.

Use this line to specify the directory location of the *.tab file. If the directory is not specified, by

default the Assembler searches first in the current directory, then in the directory where the

Assembler’s executable is located.

The '.tab' suffix may be left out—as the assembler only looks for this file type.

For example, the first line of your source code might look like:

c:\st7tools\asm\st7\

If the file st7.tab can't be found in the specified or default directories, then an error is

produced and assembly is aborted.

The rest of the source code lines have the following general format:

[label[:]]<space>[opcode]<space>[operand]<space>[;comment]

where <space> refers to either a SPACE ($20) or a TAB ($09) character.

All four fields may be left blank, but the <space> fields are mandatory unless:

●

the whole line is blank, or

●

the line begins as a comment, or

●

the line ends before the remaining fields.

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