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S3C8248/C8245/P8245/C8247/C8249/P8249
REGISTER ARCHITECTURE
In the S3C8248/C8245/C8247/C8249 implementation, the upper 64-byte area of register files is expanded two
64-byte areas, called set 1 and set 2. The upper 32-byte area of set 1 is further expanded two 32-byte register
banks (bank 0 and bank 1), and the lower 32-byte area is a single 32-byte common area.
In case of S3C8247/C8249/P8249 the total number of addressable 8-bit registers is 1122. Of these 1122
registers, 16 bytes are for CPU and system control registers, 16 bytes are for LCD data registers, 50 bytes are for
peripheral control and data registers, 16 bytes are used as a shared working registers, and 1024 registers are for
general-purpose use, page 0-page 4 (in case of S3C8248/C8245/P8245, page 0-page 2).
You can always address set 1 register locations, regardless of which of the four register pages is currently
selected. Set 1 locations, however, can only be addressed using register addressing modes.
The extension of register space into separately addressable areas (sets, banks, and pages) is supported by
various addressing mode restrictions, the select bank instructions, SB0 and SB1, and the register page pointer
(PP).
Specific register types and the area (in bytes) that they occupy in the register file are summarized in Table 2–1.
General-purpose registers (including the 16-byte
common working register area, four 192-byte prime
register area, and four 64-byte set 2 area)
LCD data registers
CPU and system control registers
Mapped clock, peripheral, I/O control, and data registers
Total Addressable Bytes
General-purpose registers (including the 16-byte
common working register area, four 192-byte prime
register area, and four 64-byte set 2 area)
LCD data registers
CPU and system control registers
Mapped clock, peripheral, I/O control, and data registers
Total Addressable Bytes
Table 2-1. S3C8247/C8249/P8249 Register Type Summary
Register Type
Table 2-2. S3C8248/C8245/P8245 Register Type Summary
Register Type
ADDRESS SPACES
Number of Bytes
1,040
16
16
50
1,122
Number of Bytes
528
16
16
50
610
2-3
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