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Assembler
5-12
| (expression)
(~ indicates bitwise complement)
symbol is any alphanumeric text starting with an alphabetic character, a number, or
an expression.
Examples:
SYM1 EQU (12 * 256)
SYM2 EQU SYM1 * (32 / 4)
SYM3 EQU SYM1 * SYM2 – *0x200
From the above example SYM1, SYM2 and SYM3 are symbols for some ex-
pression. The grammar for a Symbol is as follows:
symbol: expression
| symbol
Expression Restrictions: It is recommended that a space be inserted between the
operator (i.e., +, –, *, /, |, &) and the symbol or numeric expression to perform
arithmetic and bitwise operations. For example ADD A0, A0, 1 + –2,
adds a –1 to A0, because the argument is read as 1+(–2) = –1; but writing the
argument as 1+–2 may or may not give the correct result. Outside parenthesis
are not allowed in instruction arguments. For example, ADD A0~,A0~,(1 +
(2 * 300) – 256) causes a compile time syntax error. But removing the
outside parenthesis i.e., ADD A0~,A0~, 1 + (2 * 300) – 256, causes
no error.
#ELSE: see #IF and #IFDEF
#END_FT : This directive is created by the C– – compiler when it outputs assembly
code to a file. It marks the end of the function table used to track function calls
and C– – variables in the emulator. Users should NEVER use this directive
in an assembly language program.
#ENDIF: marks the end of a conditional assembly structure started by #IF or #IFDEF