Texas Instruments MSP50C6xx - Manual (Page 311)

Assembler
5-15 Code Development Tools
END expression: Expression defines the start vector for the current assembly
program. This directive generates the following assembly code;
AORG 0xFFFF
DATA expression
which defines the start vector of the program, i.e., the program address where
execution begins when the chip is installed.
label EQU expression: Associates the value of expression with label.
EXTERNAL symbol[,symbol]: This directive is used to indicate to the assembler that
one or more symbols are external references, i.e., symbols that will be
resolved by the linker.
GLOBAL symbol[,symbol]: This directive is used to indicate to the assembler that
one or more symbols are global references. These symbols MUST be defined
in the current file, and will be used by the linker to resolve external references
(present in other files). GLOBAL should only be used for PROGRAM labels.
RAM variables are handled with the GLOBAL_VAR directive.
GLOBAL_VAR symbol[,symbol]: This directive allows a RAM variable to be
referenced from another file. GLOBAL_VAR should be used prior to defining
a RAM variable (with the RESW directive, for example). The file that
references the variable should declare it as EXTERNAL (of REF). Note that
this technique can also be used to make constants defined with the EQU
statement available to other files.
INCLUDE filename: This directive is used to insert another file in the current assembly
file. The name of the file must be enclosed in double quotes. If the file name
itself is enclosed in angled brackets (< >), then the assembler will first look for
the include file in the include directory list that is passed as an argument during
the DLL call.
LIST: The lines following this directive are included in the listing file (extension .lst)
created by the assembler.
REF symbol[,symbol]: Equivalent to EXTERNAL directive
label RESB expression: This directive is used to reserve the number of bytes
indicated by expression, starting at the current RAM address. Label is given
the value of the current RAM address.