X9111 Datasheet, PDF (7/18 Pages) Xicor Inc. – Single Digitally-Controlled Potentiometer

X9111
CS
SCK
SI
0 101 0
1
0 X X 0 0 X X X X X X XX 0 0 0 0 0 00
ID3 ID2 ID1 ID0 0 A1 A0 R/W ^{I2 I1} I0 0 RB RA 0 0
WIP
Device ID
Internal Instruction Register
Address Opcode Address
Status
Bit
FIGURE 4. FOUR-BYTE INSTRUCTION SEQUENCE (READ STATUS REGISTERS)
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
Read Status (WIP bit)
R/W I₃
1
1
TABLE 5. INSTRUCTION SET
INSTRUCTION SET
I₂
I₁
0 RB RA 0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
1
1
0
1
0 1/0 1/0 0
0
1
1
0
0 1/0 1/0 0
1
1
1
0
0 1/0 1/0 0
0
1
1
1
0 1/0 1/0 0
1
0
1
0
0
0
0
0
NOTE: 1/0 = data is one or zero
0
OPERATION
0 Read the contents of the Wiper Counter
Register
0 Write new value to the Wiper Counter
Register
0 Read the contents of the Data Register
pointed to RB-RA
0 Write new value to the Data Register
pointed to RB-RA
0 Transfer the contents of the Data Register
pointed to by RB-RA to the Wiper Counter
Register
0 Transfer the contents of the Wiper Counter
Register to the Data Register pointed to by
RB-RA
1 Read the status of the internal write cycle,
by checking the WIP bit (read status
register).
Instruction Format
Read Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
0 A1 A0
Instruction
Opcode
1000
Register
Addresses
0000
Wiper Position
Wiper Position
(Sent by X9111 on SO)
(sent by X9111 on SO)
CS
W W W W W W W W W W Rising
X
X
X
X
X
X
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
Edge
9876543210
Write Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
0 A1 A0
Instruction
Opcode
1010
Register
Addresses
0000
Wiper Position
Wiper Position
(Sent by Master on SI)
(Sent by Master on SI)
CS
W W W W W W W W W W Rising
X
X
X
X
X
X
CCCCCCCCCC
RRRRRRRRRR
Edge
9876543210
7
FN8159.1
March 25, 2005