X9251-2.7 INTERSIL [Intersil Corporation], X9251-2.7 Datasheet - Page 12

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

Global Transfer Wiper Counter Register (WCR) to Data Register (DR)
Transfer Wiper Counter Register (WCR) to Data Register (DR)
Transfer Data Register (DR) to Wiper Counter Register (WCR)
Increment/Decrement Wiper Counter Register (WCR)
Read Status Register (SR)
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 0 0 RB RA 0 0
Device Type
Device Type
Device Type
0 1 0 1 0 0 A1 A0 1 1 1 0 RB RA 0
0
0
0
Identifier
Identifier
Identifier
Identifier
Identifier
1
1
1
0
0
0
1 0 0 A1 A0 1 1 0 1 RB RA 0
1 0 0 A1 A0 0 0 1 0 X X 0 0 I/D I/D
1 0 0 A1 A0 0 1 0 1 0 0 0 1 0
Addresses
Addresses
Addresses
Addresses
Addresses
Device
Device
12
Device
Device
Device
Instruction
Instruction
Instruction
Instruction
Opcode
Opcode
Instruction
Opcode
Opcode
Opcode
DR and WCR
Addresses
DR and WCR
Addresses
Addresses
Addresses
Addresses
WCR
WCR
X9251
DR
0
0
Rising
Edge
CS
Rising
Edge
Rising
(Sent by X9251 on SO)
Edge
0
(Sent by Master on SI)
CS
Increment/Decrement
CS
0
.
Data Byte
HIGH-VOLTAGE
0
HIGH-VOLTAGE
WRITE CYCLE
WRITE CYCLE
.
0
.
0
. I/D I/D
0
WIP
Rising
Edge
Rising
CS
Edge
CS
September 14, 2005
FN8166.2