Register Architecture - Samsung S3C9228 User Manual

S3C9228/P9228_UM_REV1.10

REGISTER ARCHITECTURE

The upper 72 bytes of the S3C9228/P9228's internal register file are addressed as working registers, system
control registers and peripheral control registers. The lower 184 bytes of internal register file (00H–B7H) is called
the general purpose register space.
For many SAM88RCRI microcontrollers, the addressable area of the internal register file is further expanded by
the additional of one or more register pages at general purpose register space (00H–BFH). This register file
expansion is implemented by page 1 in the S3C9228/P9228. The page 1 (20 × 8 bits) is for LCD display register
and can be used as general-purpose registers.
72 Bytes of
Common Area
184 Bytes
FFH
Peripheral Control
Registers
E0H
DFH
System Control
Registers
D0H
CFH
Working Registers
C0H
BFH
Peripheral Control
Registers
B8H
B7H
General Purpose
Register File
and Stack Area
~
00H
(Page 0)
Figure 2-2. Internal Register File Organization
3FH
General Purpose
64 Bytes
13H
00H
ADDRESS SPACES
Register File
LCD Display
Registers
(Page 1)
2-3