X9250 Datasheet, PDF (7/21 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometers (XDCP)

X9250
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
1 1 1 0 R₁ R₀ P₁ P₀ Transfer the contents of the Wiper Counter
Register to Data Register
Register pointed to by P₁-P₀ to the Register
pointed to by R₁–R₀
Global XFR Data Register 0 0 0 1 R₁ R₀ 0
to Wiper Counter Register
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 1 0 0 0 R₁ R₀ 0
Register to Data Register
0 Transfer the contents of all Wiper Counter
Registers to their respective data Registers
pointed to by R₁–R₀ of all four pots
Increment/Decrement
Wiper Counter Register
0 0 1 0 0 0 P₁ P₀ Enable Increment/decrement of the Wiper
Counter Register pointed to by P₁-P₀
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.
REV 1.1.5 1/31/03
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Characteristics subject to change without notice. 7 of 21