X9258 Xicor, X9258 Datasheet - Page 9

• Manufacturer Part Number: X9258
• Description: Quad Digital Controlled Potentiometers (XDCP)
• Manufacturer: Xicor

X9258
REGISTER DESCRIPTIONS
Data Registers, (8-Bit), Nonvolatile
Four 8-bit Data Registers for each DCP. (sixteen 8-bit
registers in total).
– {D7~D0}: These bits are for general purpose not
Instruction Format
Notes: (1) “MACK”/”SACK”: stands for the acknowledge sent by the master/slave.
Read Wiper Counter Register (WCR)
Write Wiper Counter Register (WCR)
Read Data Register (DR)
REV 1.1.7 2/4/03
(MSB)
S
A
R
S
A
R
S
A
R
T
T
T
T
T
T
WP7
volatile data storage or for storage of up to four
different wiper values. The contents of Data Register
0 are automatically moved to the wiper counter
register on power-up.
NV
device type
0 1 0 1
device type
0 1 0 1
device type
0 1 0 1
identifier
identifier
identifier
(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).
WP6 WP5 WP4 WP3 WP2 WP1
NV
NV
A
A
A
3
3
3
addresses
addresses
addresses
device
device
device
A
A
A
2
2
2
NV
A
A
A
1
1
1
A
A
A
0
0
0
NV
C
C
S
A
C
K
S
A
K
S
A
K
1 0 0 1 0 0
1 0 1 0 0 0
1 0 1 1
instruction
instruction
instruction
opcode
opcode
opcode
NV
NV
DR and WCR
R
1
addresses
addresses
addresses
(LSB)
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WP0
WCR
WCR
R
NV
0
P
P
1
1
P
1
P
P
0
0
P
0
S
A
C
K
S
A
C
K
Wiper Counter Register, (8-Bit), Volatile
One 8-bit Wiper Counter Register for each DCP. (Four
8-bit registers in total.)
– {D7~D0}: These bits specify the wiper position of the
(MSB)
S
A
C
K
WP7
respective DCP. 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.
W
W
P
P
V
7
(sent by master on SDA)
7
(sent by slave on SDA)
W
P
7
(sent by slave on SDA)
W
W
P
P
6
6
W
P
6
wiper position
WP6 WP5 WP4 WP3 WP2 WP1 WP0
W
W
P
P
5
5
Data Byte
V
W
P
5
Data Byte
W
W
P
P
4
4
W
P
4
W
W
P
P
3
3
V
W
P
3
Characteristics subject to change without notice.
W
W
P
P
2
2
W
P
2
W
W
P
P
1
1
V
W
P
1
W
W
P
P
0
0
W
P
0
M
C
C
A
K
S
A
K
M
A
C
K
V
O
O
S
P
S
P
T
T
S
O
P
T
V
V
(LSB)
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V