Texas Instruments MSP-FET430 E.2.8 Symbol Control Directives, See also Preprocessor Directives

TI to IAR 2.x/3.x Assembler Migration

X	SET	X+1	; Increment counter
	ENDR
	ENDM

Additional A430 Directives (IAR)	A430 Directive (IAR)
Repeatable block assembly: Formal argument is substituted by each	REPTC
character of a string.
Repeatable block assembly: formal argument is substituted by each string	REPTI
of a list of actual arguments.
See also Preprocessor Directives

E.2.8 Symbol Control Directives

The scope of assembly-time symbols differs in the two assemblers. In Asm430, definitions are global to a file, but can be undefined with the

.newblock directive. In A430, symbols are either local to a macro (LOCAL), local to a module (EQU) or global to a file (DEFINE). In addition, the preprocessor directive #define can also be used to define local symbols.

Description	Asm430 Directive (TI)	A430 Directive (IAR)
Assign a character string to a substitution	.asg	SET or VAR or ASSIGN
symbol
Undefine local symbols	.newblock	1)
Equate a value with a symbol	.equ or .set	EQU or =
Perform arithmetic on numeric substitution	.eval	SET or VAR or ASSIGN
symbols
End structure definition	.endstruct	2)
Begin a structure definition	.struct	2)
Assign structure attributes to a label	.tag	2)

1)No A430 directive directly corresponds to .newblock. However, #undef may be used to reset a symbol that was defined with the #define directive. Also, macros or modules may be used to achieve the

.newblock functionality because local symbols are implicitly undefined at the end of a macro or module.

2)Definition of structure types is not supported. Similar functionality is achieved by using macros to allocate aggregate data and base address plus symbolic offset, as shown below:

MYSTRUCT:MACRO
	DS 4
	ENDM
LO	DEFINE 0
HI	DEFINE 2
	RSEG	DATA16_Z
X	MYSTRUCT
	RSEG	CODE
	MOV	X+LO,R4
	...

Additional A430 Directives (IAR)	A430 Directive (IAR)
Define a file-wide symbol	DEFINE
Definition of special function registers (byte size)	SFRB
Definition of special function registers (word size)	SFRW

E-6