Samsung S3F80JB - Manual (Page 49)

S3F80JB ADDRESS SPACES
2-17
Together they create an
8-bit register address
Register pointer
provides five
high-order bits
Address OPCODE
Selects
RP0 or RP1
RP1
RP0
4-bit address
procides three
low-order bits
Figure 2-12. 4-Bit Working Register Addressing
Register
address
(76H)
RP0
R6
Selects RP0
Instruction:
'INC R6'
OPCODE
RP1
0 1 1 1 0 0 0 0
0 1 1 1 0 1 1 0
0 1 1 1 0 0 0 1
0 1 1 0 1 1 1 0
Figure 2-13. 4-Bit Working Register Addressing Example