Texas Instruments MSP50C614 User Manual

Page 332

Software Emulator

5-32

5.6.8

Known Differences, Incompatibilities, Restrictions

Include statements in assembly language files must enclose the file name
in double quotes.

REF/DEF statements in assembly language files should be replaced with
EXTERNAL/GLOBAL statements, but the old REF/DEF are still
supported.

There is no default type for variables in the C– – compiler. The user should
always use

int or char.

Typedef is not supported in C– –

To use external functions in C– –, put a function prototype in the file that
calls the external function.

To use external variables in C– –, declare them as

extern. Note that only

the file containing the

main routine can contain global variable

declarations.

cmm6xx.asm

is included in a project file, the resulting linked file will have

a start vector address (address 0x7FFF) of

_main1

, corresponding to a

line in

cmm6xx.asm

that forces a jump to

_main0

. The C– – compiler au-

tomatically defines a

_main0

label just prior to forcing a call to

_main

, if

there is a C– – file containing the main routine. If not, it is up to the user
to define a

_main0

label in one of the assembly language routines: this

will be the starting point of the program.