Listing 7.20 Examples of external symbols
XREF extLabel ; symbol defined in another module.
; extLabel is imported in the current module
XDEF label ; symbol is made external for other modules
; label is exported from the current module
constSec: SECTION
label: DC.W 1, extLabel
类似上述定义。你可以参考帮助手册里面的汇编说明。