Samsung S3P80C5 User Manual page 44

S3P80C5/C80C5/C80C8
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
Register
Address
1 1 0
(76H)
Figure 2-12. 4-Bit Working Register Addressing Example
OPCODE
4-bit Address
Provides Three
Low-order Bits
RP1
0 1 1 1 1
Selects RP0
R6
0 1 1 0
ADDRESS SPACES
RP0
RP1
0 0 0
OPCODE
Instruction:
1 1 1 0
'INC R6'
2-15