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S3C80A5B
0 1 1 1 0
0 1 1 1 0
Selects
RP0 or RP1
Address
Register Pointer
Provides Five
High-order Bits
Together They Create an
8-bit Register Address
Figure 2-11. 4-Bit Working Register Addressing
RP0
0 0 0
Selects RP0
Register
Address
1 1 0
(76H)
Figure 2-12. 4-Bit Working Register Addressing Example
RP0
RP1
OPCODE
4-bit Address
Provides Three
Low-order Bits
RP1
0 1 1 1 1
0 0 0
R6
OPCODE
0 1 1 0
1 1 1 0
ADDRESS SPACES
Instruction:
'INC R6'
2-15
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