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S3C8248/C8245/P8245/C8247/C8249/P8249
Selects
RP0 or RP1
Address
Register pointer
provides five
high-order bits
Figure 2-11. 4-Bit Working Register Addressing
RP0
0 1 1 1 0
0 0 0
0 1 1 1 0
1 1 0
Figure 2-12. 4-Bit Working Register Addressing Example
OPCODE
Together they create an
8-bit register address
0 1 1 1 1
Selects RP0
R6
Register
address
0 1 1 0
(76H)
RP0
RP1
4-bit address
provides three
low-order bits
RP1
0 0 0
OPCODE
Instruction
1 1 1 0
'INC R6'
ADDRESS SPACES
2-15
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