Samsung C8278X ユーザーズマニュアル
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
ADDRESS
SPACES
2-19
Together they create an
8-bit register address
Register pointer
provides five
high-order bits
provides five
high-order bits
Address
OPCODE
Selects
RP0 or RP1
RP0 or RP1
RP1
RP0
4-bit address
provides three
low-order bits
provides three
low-order bits
Figure 2-13. 4-Bit Working Register Addressing
Register
address
(76H)
address
(76H)
RP0
0 1 1 1 0
0 0 0
0 1 1 1 0
1 1 0
R6
0 1 1 0
1 1 1 0
Selects RP0
Instruction
'INC R6'
'INC R6'
OPCODE
RP1
0 1 1 1 1
0 0 0
Figure 2-14. 4-Bit Working Register Addressing Example