📄 statemen.htm

📁 一份51的编译程序,dos版本的. 英文名字MCS-51 Microcontroller Family Macro Assembler

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<STRONG><U>III.1 Statements</U></STRONG>
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Source files consist of a sequence of statements of one of the forms:
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<BLOCKQUOTE>
<STRONG><PRE>
[symbol:]  [instruction [arguments]]     [;comment]

 symbol     instruction  argument        [;comment]

$control   [(argument)]                  [;comment]
</PRE></STRONG>
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Everything that is written in brackets is optional.<BR>
The maximum length of source code lines is 255 characters.<BR>
Everything from the ';' character to the end of line is assumed to be
commentary. Blank lines are considered to be commentary, too.<BR>
The lexical elements of a statement may be separated by blanks and tabs.<BR>
Aside of character string constants, upper and lower case letters are
equivalent.
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<BR>
<STRONG>Examples:</STRONG>
<PRE>
    HERE:   MOV A,#0FFH     ;define label HERE and load A with FFH

            YEAR EQU 2002   ;define symbol for current year

    $INCLUDE (80C517.MCU)   ;include SAB80C517 register definitions
</PRE>
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