X9418_06 Datasheet, PDF (9/20 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometers

X9418
Wiper Counter Register, (6-Bit), Volatile
WP5 WP4 WP3 WP2 WP1
V
V
V
V
V
(MSB)
WP0
V
(LSB)
One 6-bit wiper counter register for each XDCP. (Four
6-bit registers in total.)
– {D5~D0}: These bits specify the wiper position of the
respective XDCP. The Wiper Counter Register is
loaded on power-up by the value in Data Register 0.
The contents of the WCR can be loaded from any of
the other Data Register or directly. The contents of
the WCR can be saved in a DR.
Instruction Format
Notes: (1) “MACK”/”SACK”: stands for the acknowledge sent by the master/slave.
(2) “A3 ~ A0”: stands for the device addresses sent by the master.
(3) “X”: indicates that it is a “0” for testing purpose but physically it is a “don’t care” condition.
(4) “I”: stands for the increment operation, SDA held high during active SCL phase (high).
(5) “D”: stands for the decrement operation, SDA held low during active SCL phase (high).
Read Wiper Counter Register (WCR)
S
T
A
R
T
device type
identifier
0101
device
addresses
AAAA
3210
S
A
C
K
instruction
opcode
1001
WCR
addresses
0
0
0
P
0
S
A
C
K
wiper position
(sent by slave on SDA)
MS
AT
WWWWWWC _O
0
0
P
5
P
4
P
3
P
2
P
1
P
0
K
P
Write Wiper Counter Register (WCR)
S
T
A
R
T
device type
identifier
0101
device
addresses
AAAA
3210
S
A
C
K
instruction
opcode
1010
WCR
addresses
0
0
0
P
0
S
A
C
K
wiper position
(sent by master on SDA)
S
A
0
0
W
P
5
W
P
4
W
P
3
W
P
2
W
P
1
W
P
0
C
K
S
T
O
P
Read Data Register (DR)
S
T
A
R
T
device type
identifier
0101
device
addresses
AAAA
3210
S
A
C
K
instruction
opcode
1011
DR and WCR
addresses
R
1
R
0
0
P
0
S
A
C
K
wiper position/data
(sent by slave on SDA)
MS
AT
WWWWWWC _O
0
0
P
5
P
4
P
3
P
2
P
1
P
0
K
P
Write Data Register (DR)
S
T
A
R
T
device type
identifier
0101
device
addresses
AAAA
3210
S
A
C
K
instruction
opcode
1100
DR and WCR
addresses
S
A
wiper position/data
(sent by master on SDA)
S
A
S
T
R
1
R
0
0
P0
C
K
0
0
WW
PP
54
WWWW
PPPP
3210
C
K
O
P
HIGH-VOLTAGE
WRITE CYCLE
XFR Data Register (DR) to Wiper Counter Register (WCR)
S
T
A
R
T
device type
identifier
0101
device
addresses
AAAA
3210
S
A
C
K
instruction
opcode
1101
DR and WCR
addresses
R
1
R
0
0
P
0
S
A
C
K
S
T
O
P
9
FN8194.3
October 12, 2006