Texas Instruments TMS320C54x User Manual page 82

Cross-Reference Listings
3-36
Note that when the assembler generates a cross–reference listing for an
assembly file that contains .include directives, it keeps a record of the include
file and line number in which a symbol is defined/referenced. It does this by
assigning a letter reference (A, B, C, etc.) for each include file. The letters are
assigned in the order in which the .include directives are encountered in the
assembly source file.
For example, the following source files:
(a) incl0.asm
.global ABC
nop
nop
(b) incl1.asm
.global ABC
ld ABC, A
(c) incl2.asm
.global ABC
stl A,ABC
(d) xref.asm
start:
.include "incl0.asm"
.include "incl1.asm"
add #10,A
.include "incl2.asm"
nop
nop
b start
.global
.bss ABC,2
start