Bit Working Register Addressing Example - Samsung S3C8275X User Manual

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
Selects
RP0 or RP1
Address
Register pointer
provides five
high-order bits
Figure 2-13. 4-Bit Working Register Addressing
RP0
0 1 1 1 0 0 0 0
0 1 1 1 0 1 1 0
Figure 2-14. 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
2-19