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How do I view the contents of sfr's in the UV2 debugger?
might not work for SFRs outside the "standard" 8051 set; ie, extra SFRs provided by specific 8051 extensions/variations. See the thread "uVision2 Debug Fn: Access to Extended Registers" http://www.keil.com/forum/msgpage.asp?MsgID=1185
So, I think it must work by writing the adress of the specific SFR. Just by looking on the datasheet of the component.
Yes. For "standard" SFRs, you can just type the name like "R0" or "DPTR;" For "extended" SFRs, you may have to resort to looking up absolute hardware addresses (that's what I had to do for the Triscend)