CAT5411
http://onsemi.com
10
XFR Data Register to Wiper Control Register
This transfers the contents of one specified Data
Register to the associated Wiper Control Register.
XFR Wiper Control Register to Data Register
This transfers the contents of the specified Wiper
Control Register to the specified associated Data
Register.
Global XFR Data Register to Wiper Control
Register
This transfers the contents of all specified Data
Registers to the associated Wiper Control Registers.
Global XFR Wiper Counter Register to Data
Register
This transfers the contents of all Wiper Control Registers
to the specified associated Data Registers.
Increment/Decrement Command
The final command is Increment/Decrement (Figures 9
and 10). The Increment/Decrement command is different
from the other commands. Once the command is issued the
master can clock the selected wiper up and/or down in one
segment steps; thereby providing a fine tuning capability to
the host. For each SCK clock pulse (t
HIGH
) while SI is
HIGH, the selected wiper will move one resistor segment
towards the R
H
terminal. Similarly, for each SCK clock
pulse while SI is LOW, the selected wiper will move one
resistor segment towards the R
L
terminal.
See Instructions format for more detail.
0101
A2 A0
I2 I1
I0
R1 R0 0
SI
ID3 ID1
P0
Device ID
Internal
Instruction
Opcode
Address
Register
Address
Pot/WCR
Address
A1
A3
I3
00
Figure 7. Two-byte Instruction Sequence
I3 I2 I1 I0 R1 R0
ID3 ID2 ID1 ID0
Device ID
Internal
Instruction
Opcode
Address
Data
Register
Address
Pot/WCR
Address
WCR[7:0]
or
Data Register D[7:0]
010100
A2 A1 A0
0P0
SI
D7 D6 D5 D4 D3 D2 D1 D0
A3
Figure 8. Three-byte Instruction Sequence
I3 I2
I1
I0
ID3 ID2 ID1
Device ID
Internal
Instruction
Opcode
Address
Data
Register
Address
Pot/WCR
Address
010100
A2 A1 A0
R0 0 P0
SI
I
N
C
1
I
N
C
2
I
N
C
n
D
E
C
1
D
E
C
n
R1
A3
Figure 9. Increment/Decrement Instruction Sequence
ID2 ID0
ID0
SCK
SI
INC/DEC
Command
Issued
Voltage Out
Figure 10. Increment/Decrement Timing Limits
t
WRL
R
W
