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ADDRESS SPACES S3C84E5/C84E9/P84E9
2-14
COMMON WORKING REGISTER AREA (C0H–CFH)
After a reset, register pointers RP0 and RP1 automatically select two 8-byte register slices in set 1, locations C0H–
CFH, as the active 16-byte working register block:
RP0 → C0H–C7H
RP1 → C8H–CFH
This 16-byte address range is called common area. That is, locations in this area can be used as working registers
by operations that address any location on any page in the register file. Typically, these working registers serve as
temporary buffers for data operations between different pages.
FFH
F0H
E0H
D0H
C0H
Set 1
FFH
FFH
C0H
Set 2
00H
Prime
Space
BFH
Page 0
Page 0
RP0 =
RP1 =
1 1 0 0 0 0 0 0
1 1 0 0 1 0 0 0
~ ~
~
Page 1
Following a hardware reset, register
pointers RP0 and RP1 point to the
common working register area,
locations C0H-CFH.
Figure 2-10. Common Working Register Area