X9420 Datasheet, PDF (7/20 Pages) Xicor Inc. – Single Digitally Controlled (XDCP) Potentiometer

X9420
Table 3. Instruction Set
Instruction
Read Wiper Counter
Register
Write Wiper Counter
Register
Read Data Register
Instruction Set
I₃ I₂ I₁ I₀ R₁ R₀
10010 0 0
10100 0 0
1 0 1 1 R₁ R₀ 0
Write Data Register
1 1 0 0 R₁ R₀ 0
XFR Data Register to
Wiper Counter
Register
XFR Wiper Counter
Register to Data
Register
Increment/Decrement
Wiper Counter
Register
Read Status (WIP bit)
1 1 0 1 R₁ R₀ 0
1 1 1 0 R₁ R₀ 0
00100 0 0
01010 0 0
Operation
0 Read the contents of the Wiper Counter Register
0 Write new value to the Wiper Counter Register
0 Read the contents of the Data Register pointed to
by R₁–R₀
0 Write new value to the Data Register pointed to by
R₁–R₀
0 Transfer the contents of the Data Register pointed
to by R₁–R₀ to the Wiper Counter Register
0 Transfer the contents of the Wiper Counter
Register to the Data Register pointed to by R₁–R₀
0 Enable Increment/decrement of the Wiper Counter
Register
1 Read the status of the internal write cycle, by
checking the WIP bit.
REV 1.1.6 7/30/02
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Characteristics subject to change without notice. 7 of 20