Chapter 7 Type of Source Statements
Program Format 119
7.2 Program Format
A program is text created to assemble as machine language instructions in order to operate a micropro-
cessor. The assembler translates the text into machine language code, while the linker joins that code to
make an executable format file.
One line of text is called a source statement. There are five types of source statements, with the type
determining how a source statement is written.
Basic program format is shown below.
There are several points to be aware of when writing programs.
• Always declare an attribute and link type for a section name the first time it appears in a file.The
same section name cannot be set to a different attribute or link type.
• The effective scope of a directive coding rule section is until the line preceding the next directive
coding rule section
• Ignore all text after the directive coding rule instruction.
* Comment statement Write comments as needed
#include #include specifications
#define Define #define identifiers
definitions of constants, macros, globals Statements to define constants and macros and to
declare and define globals
section name section Declare start of section
.
.
.
program body Machine language instructions, conditional assembly
directives, macro expansions
.
.
.
end End of program
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