X9271_14 Datasheet, PDF (9/18 Pages) Intersil Corporation – Single, Digitally Controlled Potentiometer

X9271
SCK
tWRID
SI
VW
VOLTAGE OUT
INC/DEC CMD ISSUED
FIGURE 6. INCREMENT/DECREMENT TIMING LIMITS
INSTRUCTION
Read Wiper Counter Register
Write Wiper Counter Register
Read Data Register
Write Data Register
XFR Data Register to
Wiper Counter Register
XFR Wiper Counter
Register to Data Register
Increment/Decrement
Wiper Counter Register
Read Status (WIP Bit)
TABLE 8. INSTRUCTION SET
INSTRUCTION SET
(1/0 = DATA IS ONE OR ZERO)
I3 I2 I1 I0 RB RA P₁ P₀
OPERATION
1
0
010
0
0 1/0 Read contents of Wiper Counter Register.
1
0
100
0
0 1/0 Write new value to Wiper Counter Register.
1 0 1 1 1/0 1/0 1/0 1/0 Read contents of Data Register pointed to by P1 - P0
and RB - RA.
1 1 0 0 1/0 1/0 1/0 1/0 Write new value to Data Register pointed to by P1 - P0
and RB - RA.
1 1 0 1 1/0 1/0 0
0 Transfer contents of Data Register pointed to by
RB - RA (Bank 0 only) to Wiper Counter Register.
1 1 1 0 1/0 1/0 0
0 Transfer contents of Wiper Counter Register to Register
pointed to by RB-RA (Bank 0 only).
0
0
100
0
0
0 Enable increment/decrement of the Wiper Counter
Register.
0
1
010
0
0
1 Read status of internal write cycle by checking WIP bit.
Instruction Format
Read Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
0 0 A1 A0 1 0 0 1
DR/Bank
Addresses
00 0 0
Wiper Position
(Sent by X9271 on SO)
WWWWWWWW
CCCCCCCC
RRRRRRRR
76543210
CS
Rising
Edge
Write Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
0 0 A1 A0 1 0 1 0
DR/Bank
Addresses
00 0 0
Data Byte
(Sent by Host on SI)
WWWWWWWW
CCCCCCCC
RRRRRRRR
76543210
CS
Rising
Edge
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9
FN8174.4
July 18, 2014