X9420_06 Datasheet, PDF (9/19 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer

X9420
Instruction Format
Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.
(2) WPx refers to wiper position data in the Wiper Counter Register
“I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
(3) “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Read Wiper Counter Register (WCR)
device type device instruction
wiper position
CS ^{identifier addresses opcode}
(sent by X9420 on SO) _CS
Falling
Edge
0
1
0
1
1
1
0
A
0
1
0
0
1
0
0
0
0
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Write Wiper Counter Register (WCR)
device type device instruction
Data Byte
CS ^{identifier addresses opcode}
(sent by Host on SI)
CS
Falling
Edge
0
1
0
1
1
1
0
A
0
1
0
1
0
0
0
0
0
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Read Data Register (DR)
Read the contents of the Register pointed to by R1 - R0.
CS
Falling
Edge
device type
identifier
0101
device
addresses
1
1
0
A
0
instruction
opcode
1011
register
addresses
R
1
R
0
0
0
Data Byte
(sent by X9420 on SO) _CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Write Data Register (DR)
Write a new value to the Register pointed to by R1 - R0.
device type device instruction register
CS ^{identifier addresses opcode addresses}
Falling
Edge
0
1
0
1
1
1
0
A
0
1
1
0
0
R
1
R
0
0
0
Data Byte
(sent by host on SI)
CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
HIGH-VOLTAGE
WRITE CYCLE
Transfer Data Register (DR) to Wiper Counter Register (WCR)
Transfer the contents of the Register pointed to by R1 - R0 to the WCR.
CS
Falling
Edge
device type
identifier
0101
device
addresses
1
1
0
A
0
instruction
opcode
1101
register
addresses
R
1
R
0
0
0
CS
Rising
Edge
9
FN8195.1
April 26, 2006