X9251-2.7 INTERSIL [Intersil Corporation], X9251-2.7 Datasheet - Page 11

• Manufacturer Part Number: X9251-2.7
• Description: Single Supply/Low Power/256-Tap/SPI Bus
• Manufacturer: INTERSIL [Intersil Corporation]

INSTRUCTION FORMAT
Read Wiper Counter Register (WCR)
Write Wiper Counter Register (WCR)
Read Data Register (DR)
Write Data Register (DR)
Global Transfer Data Register (DR) to Wiper Counter Register (WCR)
Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.
Falling
Falling
Falling
Falling
Falling
Edge
Edge
Edge
Edge
Edge
CS
CS
CS
CS
CS
(2) WPx refers to wiper position data in the Counter Register
(2) “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).
Device Type
Device Type
0 1 0 1 0 0 A1 A0 1 0 1 1 RB RA P1 P0
0 1 0 1 0 0 A1 A0 1 1 0 0 RB RA P1 P0
Device Type
0
Device Type
0
0
Device Type
Identifier
Identifier
Identifier
Identifier
Identifier
1
1
1
0
0
0
1
1 0 0 A1 A0 1 0 1 0 0 0
1 0 0 A1 A0 1 0 0 1 0 0
0
Addresses
Addresses
Addresses
Addresses
Addresses
Device
Device
11
Device
Device
Device
0 A1 A0 0 0 0 1 RB RA 0 0
Instruction
Instruction
Opcode
Instruction
Instruction
Opcode
Instruction
Opcode
Opcode
Opcode
DR and WCR
Addresses
DR and WCR
Addresses
Addresses
Addresses
Addresses
X9251
WCR
WCR
DR
0
0
0
0
W
C
R
W
7
C
R
7
D
(Sent by X9251 on SO)
7
(Sent by Host on SI)
D
W
7
(Sent by Host on SI)
Rising
W
C
R
6
C
R
Edge
6
(Sent by X9271 on SO)
D
6
CS
Wiper Position
D
W
6
C
R
W
5
C
R
5
Data Byte
D
5
Data Byte
D
W
5
C
R
W
4
C
R
4
Data Byte
D
4
D
W
4
C
R
W
3
C
R
3
D
3
D
W
3
C
R
W
C
R
2
2
D
2
D
W
2
C
R
W
C
R
1
1
D
1
D
W
1
C
R
W
C
R
0
D
0
0
D
0
Rising
Rising
Rising
Edge
Edge
Edge
CS
CS
CS
Rising
Edge
CS
September 14, 2005
FN8166.2