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Register Select Command Register
D7
D6
1
0
D5
D4
D3
S4
D2
D1
D0
S2
S1
S0
Register numbers
OTS Control
0: OTS terminal = L
1: OTS terminal = H
Register group Slection
0: Standard group
1: Extension group
Input/Output Mode Selection
0: Input/output of every 8 bits
1: Collective input/output
D7
1
1
1
1
1
1
1
1
1
1
1
1
1
I
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
D4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
D3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Figure 4
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
Dl
0
0
1
I
0
0
1
1
0
0
1
1
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
Selects register R0.
Selects register R1.
Selects register R2.
Selects register R3.
Selects register R4.
Selects register R5.
Selects register R6.
Selects register R7.
Selects register R10.
Selects register R11.
Selects register R12.
Selects register R13.
Selects register R16.
Selects register R17.
Example of Register Select Commands
7