Common Working Register Area (C0H-Cfh) - Samsung S3C80M4/F80M4 User Manual

S3C80M4/F80M4
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.
Following a hardware reset, register
pointers RP0 and RP1 point to the
common working register area,
locations C0H-CFH.
Set 1
FFH
FCH
E0H
D0H
C0H
RP0 = 1 1 0 0 0 0 0 0
RP1 = 1 1 0 0 1 0 0 0
Figure 2-10. Common Working Register Area
FFH
Set 2
(Not used for
the S3C80M4)
C0H
7FH
Page 0
Prime
Space
00H
ADDRESS SPACES
2-13