X9271 Datasheet, PDF (10/23 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

X9271
Figure 5. Increment/Decrement Instruction Sequence
CS
SCL
SI
0 1 0 1 00
00
ID3 ID2 ID1 ID0 0 0 A1 A0
I3 I2 I1 I0 RA RB ^P1 P0
II
ID
D
NN
NE
E
Device ID
Internal
Address
Instruction
Opcode
Register
Address
Pot/Bank
Address
C
1
C
2
CC
n1
C
n
Figure 6. Increment/Decrement Timing Limits
SCK
tWRID
SI
VW
VOLTAGE OUT
INC/DEC CMD ISSUED
Table 6. Instruction Set
Instruction Set
Instruction
Read Wiper Counter
Register
I3 I2 I1 I0 RB RA P₁ P₀
Operation
1 0 0 1 0 0 0 1/0 Read the contents of the Wiper Counter
Register
Write Wiper Counter
Register
1 0 1 0 0 0 0 1/0 Write new value to the Wiper Counter
Register
Read Data Register
1 0 1 1 1/0 1/0 1/0 1/0 Read the contents of the Data Register
pointed to by P1-P0 and RB-RA
Write Data Register
1 1 0 0 1/0 1/0 1/0 1/0 Write new value to the Data Register
pointed to by P1-P0 and RB-RA
XFR Data Register to
Wiper Counter Register
1 1 0 1 1/0 1/0 0
0 Transfer the contents of the Data Register
pointed to by RB-RA (Bank 0 only) to the
Wiper Counter Register
XFR Wiper Counter
1 1 1 0 1/0 1/0 0
Register to Data Register
0 Transfer the contents of the Wiper Counter
Register to the Register pointed to by RB-RA
(Bank 0 only)
Increment/Decrement
Wiper Counter Register
0 0 1 0 0 0 0 0 Enable Increment/decrement of the Wiper
Counter Register
Read Status (WIP bit)
0 1 0 1 0 0 0 1 Read the status of the internal write cycle, by
checking the WIP bit.
Note: 1/0 = data is one or zero
REV 1.1.7 2/6/03
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Characteristics subject to change without notice. 10 of 23