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S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X ADDRESS SPACES
2-17
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
Page 1
Set 2
FFH
C0H
00H
BFH
Page 0
Set 2
Page 0
Prime
Space
LCD Data
Registers
Page 2
00H
0FH
FFH
FCH
E0H
D0H
C0H
Set 1
Following a hardware reset, register
pointers RP0 and RP1 point to the
common working register area,
locations C0H-CFH.
RP0 =
RP1 =
1 1 0 0 0 0 0 0
1 1 0 0 1 0 0 0
~ ~
~
NOTE: In case of S3C8278X/C8274X, there are page 0 and page 2.
Page 2 is for LCD display register, 16 bytes.
Figure 2-12. Common Working Register Area