X9400 Datasheet, PDF (7/22 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometers (XDCP)

X9400
Figure 8. Increment/Decrement Timing Limits
SCK
SI
t_WRID
V_W/R_W
Voltage Out
INC/DEC CMD Issued
Table 1. Instruction Set
Instruction Set
Instruction
I₃ I₂ I₁ I₀ R₁ R₀ P₁ P₀
Operation
Read Wiper Counter Register 1 0 0 1 0 0 P₁ P₀ Read the contents of the Wiper Counter Register
pointed to by P₁-P₀
Write Wiper Counter Register 1 0 1 0 0 0 P₁ P₀ Write new value to the Wiper Counter Register
pointed to by P₁-P₀
Read Data Register
1 0 1 1 R₁ R₀ P₁ P₀ Read the contents of the Data Register pointed
to by P₁-P₀ and R₁–R₀
Write Data Register
1 1 0 0 R₁ R₀ P₁ P₀ Write new value to the Data Register pointed to
by P₁-P₀ and R₁–R₀
XFR Data Register to Wiper
Counter Register
1 1 0 1 R₁ R₀ P₁ P₀ Transfer the contents of the Data Register pointed
to by R₁–R₀ to the Wiper Counter Register pointed
to by P₁-P₀
XFR Wiper Counter Register 1 1 1 0 R₁ R₀ P₁ P₀ Transfer the contents of the Wiper Counter
to Data Register
Register pointed to by P₁-P₀ to the Register
pointed to by R₁–R₀
Global XFR Data Register to
Wiper Counter Register
0 0 0 1 R₁ R₀ 0
0 Transfer the contents of the Data Registers
pointed to by R₁–R₀ of all four pots to their
respective Wiper Counter Register
Global XFR Wiper Counter
Register to Data Register
Increment/Decrement Wiper
Counter Register
Read Status (WIP bit)
1 0 0 0 R₁ R₀ 0 0 Transfer the contents of all Wiper Counter
Registers to their respective data Registers
pointed to by R₁–R₀ of all four pots
0 0 1 0 0 0 P₁ P₀ Enable Increment/decrement of the Wiper
Counter Register pointed to by P₁-P₀
0 1 0 1 0 0 0 1 Read the status of the internal write cycle, by
checking the WIP bit.
REV 1.1.4 10/11/02
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Characteristics subject to change without notice. 7 of 22