Renesas Technology, Tools FAQs
Last Updated: December 20, 2000
Document Number: 01051264_e
Q.
The FB Register is defined in ncrt0.a30, what is it used for? Can I modify its contents?
[FB Register defined place]
ldc #0h,fb ; for debuger
A.
The FB Register is described in ncrt0.a30 for the debugger stack-trace. The FB Register is initialized to zero so that when the
debugger performs a stack-trace, it determines the origin of the function call and then confirms the start or completion of the
function call when the FB Register value becomes "0" (zero). Therefore, as long as you are not performing a stack-trace during
debugging, the contents of the FB Register can be changed.
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