X9421WV14IZ Datasheet, PDF (9/20 Pages) Intersil Corporation – Single Voltage Potentiometer

X9421
TABLE 3. INSTRUCTION SET
INSTRUCTION SET
INSTRUCTION
Read Wiper Counter Register
I₃ I₂ I₁ I₀ R₁ R₀
10010 0 0
OPERATION
0 Read the contents of the Wiper Counter Register
Write Wiper Counter Register
1 0 1 0 0 0 0 0 Write new value to the Wiper Counter Register
Read Data Register
1 0 1 1 1/0 1/0 0
Write Data Register
1 1 0 0 1/0 1/0 0
XFR Data Register to Wiper
Counter Register
1 1 0 1 1/0 1/0 0
XFR Wiper Counter Register to Data 1 1 1 0 1/0 1/0 0
Register
Increment/Decrement Wiper
Counter Register
00100 0 0
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
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.
Instruction Format
NOTES:
1. “A0”: stands for the device addresses sent by the master.
2. WPx refers to wiper position data in the Wiper Counter Register
“I”: stands for the increment operation, SI held HIGH during
active SCK phase (high).
3. “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
Read Wiper Counter Register (WCR)
CS
FALLING
EDGE
DEVICE
TYPE
IDENTIFIER
0101
DEVICE
ADDRESSES
1 1 0 A0
INSTRUCTION
OPCODE
1001
WIPER POSITION
(SENT BY X9421 ON SO)
CS
RISING
0 0 0 0 0 0 WP5 WP4 WP3 WP2 WP1 WP0 EDGE
Write Wiper Counter Register (WCR)
DEVICE
TYPE
CS
IDENTIFIER
FALLING
DEVICE
INSTRUCTION
ADDRESSES
OPCODE
DATA BYTE
(SENT BY HOST ON SI)
CS
RISING
EDGE 0 1 0 1 1 1 0 A0 1 0 1 0 0 0 0 0 0 0 WP5 WP4 WP3 WP2 WP1 WP0 EDGE
Read Data Register (DR)
Read the contents of the Register pointed to by R1 - R0.
DEVICE
TYPE
CS
IDENTIFIER
FALLING
DEVICE
INSTRUCTION
ADDRESSES OPCODE
REGISTER
ADDRESSES
DATA BYTE
(SENT BY X9421 ON SO)
CS
RISING
EDGE 0 1 0 1 1 1 0 A0 1 0 1 1 R1 R0 0 0 0 0 WP5 WP4 WP3 WP2 WP1 WP0 EDGE
Write Data Register (DR)
Write a new value to the Register pointed to by R1 - R0.
DEVICE
TYPE
DEVICE INSTRUCTION REGISTER
DATA BYTE
IDENTIFIER ADDRESSES OPCODE ADDRESSES
(SENT BY HOST ON SI)
CS
CS
FALLING 0 1 0 1 1 1 0 A 1 1 0 0 R R 0 0 0 0 WP WP WP WP WP WP RISING
EDGE
0
10
5 4 3 2 1 0 EDGE
HIGH-VOLTAGE
WRITE CYCLE
9
FN8196.4
January 14, 2009