X9401_06 Datasheet, PDF (8/19 Pages) Intersil Corporation – Quad, 64 Tap, Digitally Controlled Potentiometer

X9401
Instruction Format
Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.
(2) WPx refers to wiper position data in the Counter Register
(3) “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
(4) “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Read Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1001
WCR
addresses
0
0
P
1
P
0
wiper position
(sent by X9401 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1010
WCR
addresses
0
0
P
1
P
0
Data Byte
(sent by Host on SI)
CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Read Data Register (DR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1011
DR and WCR
addresses
RRPP
1010
Data Byte
(sent by X9401 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Data Register (DR)
device type
CS ^identifier
Falling
Edge _{0 1 0 1}
device instruction
addresses opcode
0
0
A
1
A
0
1
1
0
0
DR and WCR
addresses
RRPP
1010
Data Byte
(sent by host on SI)
CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
HIGH-VOLTAGE
WRITE CYCLE
Transfer Data Register (DR) to Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1101
DR and WCR
addresses
RRPP
1010
CS
Rising
Edge
8
FN8190.3
October 12, 2006