X9258 Datasheet, PDF (6/22 Pages) Xicor Inc. – Quad Digital Controlled Potentiometers (XDCP)

X9258
Table 1. Instruction Set
Instruction
Read Wiper Counter
Register
Write Wiper Counter
Register
Read Data Register
Write Data Register
XFR Data Register to
Wiper Counter Regis-
ter
XFR Wiper Counter
Register to Data
Register
Global XFR Data
Registers to Wiper
Counter Registers
Global XFR Wiper
Counter Registers
to Data Register
Increment/Decrement
Wiper Counter Regis-
ter
Instruction Set
I₃ I₂ I₁ I₀ R₁ R₀ P₁ P₀
Operation
1 0 0 1 0 0 1/0 1/0 Read the contents of the Wiper Counter Regis-
ter pointed to by P₁–P₀
1 0 1 0 0 0 1/0 1/0 Write new value to the Wiper Counter Register
pointed to by P₁–P₀
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 R₁–R₀
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 R₁–R₀
1 1 0 1 1/0 1/0 1/0 1/0 Transfer the contents of the Data Register point-
ed to by P₁–P₀ and R₁–R₀ to its associated Wip-
er Counter Register
1 1 1 0 1/0 1/0 1/0 1/0 Transfer the contents of the Wiper Counter Reg-
ister pointed to by P₁–P₀ to the Data Register
pointed to by R₁–R₀
0 0 0 1 1/0 1/0 0
0 Transfer the contents of the Data Registers
pointed to by R₁–R₀ of all four pots to their re-
spective Wiper Counter Registers
1 0 0 0 1/0 1/0 0
0 Transfer the contents of both Wiper Counter
Registers to their respective data Registers
pointed to by R₁–R₀ of all four pots
0 0 1 0 0 0 1/0 1/0 Enable Increment/decrement of the Control
Latch pointed to by P₁–P₀
Note: (1) 1/0 = data is one or zero
Figure 4. Three-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 P1 P0 A D7 D6 D5 D4 D3 D2 D1 D0 A S
T
C
C
CT
A
K
K
KO
R
P
T
REV 1.1.7 2/4/03
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