Samsung C8278X ユーザーズマニュアル

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ADDRESS SPACES 
 
 S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X 
2-10 
 
REGISTER SET 1 
The term set 1 refers to the upper 64 bytes of the register file, locations C0H–FFH.  
The upper 32-byte area of this 64-byte space (E0H–FFH) is expanded two 32-byte register banks, bank 0 and 
bank 1. The set register bank instructions, SB0 or SB1, are used to address one bank or the other. A hardware 
reset operation always selects bank 0 addressing.  
The upper two 32-byte areas (bank 0 and bank 1) of set 1 (E0H–FFH) contains 48 mapped system and 
peripheral control registers. The lower 32-byte area contains 16 system registers (D0H–DFH) and a 16-byte 
common working register area (C0H–CFH). You can use the common working register area as a “scratch” area 
for data operations being performed in other areas of the register file.   
Registers in set 1 locations are directly accessible at all times using Register addressing mode. The 16-byte 
working register area can only be accessed using working register addressing (For more information about 
working register addressing, please refer to Chapter 3, “Addressing Modes.”) 
REGISTER SET 2 
The same 64-byte physical space that is used for set 1 locations C0H–FFH is logically duplicated to add another 
64 bytes of register space. This expanded area of the register file is called set 2. For the S3C8275X,  
the set 2 address range (C0H–FFH) is accessible on pages 0–1.  
S3C8278X/C8274X, the set 2 address range (C0H–FFH) is accessible on page 0.  
The logical division of set 1 and set 2 is maintained by means of addressing mode restrictions. You can use only 
Register addressing mode to access set 1 locations. In order to access registers in set 2, you must use Register 
Indirect addressing mode or Indexed addressing mode.  
The set 2 register area is commonly used for stack operations.