X9430 Datasheet, PDF (8/21 Pages) Xicor Inc. – Dual Digitally Controlled Potentiometer (XDCP™) with Operational Amplifier

X9430 – Preliminary Information
REGISTER DESCRIPTIONS AND MEMORY MAP
Memory Map
WCRO
DR0
DR1
DR2
DR3
WCR1
DR0
DR1
DR2
DR3
Wiper Counter Register (WCR)
0 0 WP5 WP4 WP3 WP2 WP1 WP0
(volatile)
(LSB)
WP0-WP5 identify wiper position.
Data Registers (DR, R0-R3)
Wiper Position or User Data
(Nonvolatile)
Instruction Format
Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.
(2) WPx refers to wiper position data in the Wiper Counter Register
(3) “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
(4) “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Read Wiper Counter Register (WCR)
Read the contents of the Wiper Counter Register pointed to by P₁-P₀
device type device instruction
WCR
wiper position
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1001
addresses
0
0
0
P
0
(sent by X9430 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Wiper Counter Register (WCR)
Write new value to the Wiper Counter Register pointed to by P₁-P₀
device type device instruction
WCR
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1010
addresses
0
0
0
P
0
Data Byte
(sent by Host on SI)
CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Read Data Register (DR)
Read the contents of the Register pointed to by P₁-P₀ and R₁-R₀
device type device instruction DR/WCR
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1011
addresses
R
1
R
0
0
P
0
Data Byte
(sent by X9430 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Data Register (DR)
Write new value to the Register pointed to by P₁-P₀ and R₁-R₀
device type device instruction DR/WCR
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1100
addresses
R
1
R
0
0
P
0
Data Byte
(sent by host on SI)
CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
HIGH-VOLTAGE
WRITE CYCLE
REV 1.0 6/20/00
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Characteristics subject to change without notice. 8 of 21