X9258_13 Datasheet, PDF (9/19 Pages) Intersil Corporation – Low Noise/Low Power/2-Wire Bus/256 Taps

X9258
Wiper Counter Register, (8-bit), Volatile
WP7
V
(MSB)
WP6
V
WP5
V
WP4
V
WP3
V
WP2
V
WP1
V
WP0
V
(LSB)
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
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.
Instruction Format
NOTES:
5. “MACK”/”SACK”: stands for the acknowledge sent by the
master/slave.
6. “A3 ~ A0”: stands for the device addresses sent by the master.
7. “X”: indicates that it is a “0” for testing purpose but physically it is
a “don’t care” condition.
8. “I”: stands for the increment operation, SDA held high during
active SCL phase (high).
9. “D”: stands for the decrement operation, SDA held low during
active SCL phase (high).
Read Wiper Counter Register (WCR)
S DEVICE TYPE DEVICE
INSTRUCTION WCR
WIPER POSITION
T IDENTIFIER ADDRESSES S OPCODE ADDRESSES S
(SENT BY SLAVE ON SDA)
MS
A
A
A
AT
R ^{0 1 0 1 A3 A2 A1 A0} C ^{1 0 0 1 0 0 P1 P0} C ^{WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0} C O
T
K
K
KP
Write Wiper Counter Register (WCR)
S DEVICE
T TYPE
DEVICE
S
A IDENTIFIER ADDRESSES A
R _{0 1 0 1 A3 A2 A1 A0} C
T
K
INSTRUCTION
OPCODE
1010
WCR
S
DATA BYTE
SS
ADDRESSES A
(SENT BY MASTER ON SDA)
AT
0 0 P1 P0 ^C WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0 ^{C O}
K
KP
Read Data Register (DR)
S DEVICE TYPE DEVICE
INSTRUCTION DR AND WCR
DATA BYTE
T IDENTIFIER ADDRESSES S OPCODE
ADDRESSES S
(SENT BY SLAVE ON SDA)
MS
A
A
A
AT
R ^{0 1 0 1 A3 A2 A1 A0} C ^{1 0 1 1 R1 R0 P1 P0} C ^{WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0} C O
T
K
K
KP
Write Data Register (WR)
S DEVICE
T TYPE
A IDENTIFIER
R
T^{0 1 0 1}
DEVICE S INSTRUCTION
ADDRESSES A OPCODE
C
A3 A2 A1 A0 _K 1 1 0 0
HIGH-VOLTAGE
DR AND WCR S
DATA BYTE
S S WRITE CYCLE
ADDRESSES A
(SENT BY MASTER ON SDA)
AT
C
CO
R1 R0 P1 P0 _K WP7 WP6 WP5 WP4 WP3 WP2 WP1 WP0 _{K P}
9
FN8168.6
December 15, 2011