X9241A
The Increment/Decrement command is different from
the other commands. Once the command is issued and
the X9241A has responded with an acknowledge, the
master can clock the selected wiper up and/or down in
one segment steps; thereby, providing a fine tuning
resistor segment towards the V /R terminal. Similarly,
H H
for each SCL clock pulse while SDA is LOW, the
selected wiper will move one resistor segment towards
the V /R terminal. A detailed illustration of the
L
L
sequence and timing for this operation are shown in
Figures 5 and 6 respectively.
capability to the host. For each SCL clock pulse (t
)
HIGH
while SDA is HIGH, the selected wiper will move one
Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S
T
A
R
T
0
1
0
1
A3 A2 A1 A0
I3 I2
I1 I0
P1 P0 R1 R0
A
C
K
S
T
O
P
A
C
K
Figure 4. Three-Byte Instruction Sequence
SCL
SDA
S
T
A
R
T
0
1
0
1
A3 A2 A1 A0
I3 I2
I1 I0 P1 P0 R1 R0
DW D5 D4 D3 D2
S
T
A
C
K
A
C
K
CM
D1 D0
A
C
K
O
P
Figure 5. Increment/Decrement Instruction Sequence
SCL
SDA
X
X
A
C
K
S
T
A
R
T
0
1
0
1
A3 A2 A1 A0
I3 I2
I1 I0 P1 P0 R1 R0
A
C
K
I
I
I
D
E
C
1
D
S
N
C
1
N
C
2
N
C
n
E
C
n
T
O
P
Characteristics subject to change without notice. 5 of 18
REV 1.1.13 12/09/02
www.xicor.com
XICOR [ XICOR INC. ]
