Assembler

(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

5-12

Page 308
Image 308
Texas Instruments MSP50C6xx manual #ELSE see #IF and #IFDEF, An assembly language program