X9271-2.7 INTERSIL [Intersil Corporation], X9271-2.7 Datasheet - Page 9

• Manufacturer Part Number: X9271-2.7
• Description: Single Supply/Low Power/256-Tap/SPI Bus
• Manufacturer: INTERSIL [Intersil Corporation]

Figure 2. Two-Byte Instruction Sequence
Figure 3. Three-Byte Instruction Sequence (Write)
Figure 4. Three-Byte Instruction Sequence (Read)
SCL
CS
SI
S0
SCL
SI
CS
ID3 ID2 ID1 ID0
ID3 ID2 ID1 ID0
SCK
0
CS
SI
0
Device ID
1
Device ID
1
0
0
1
ID3 ID2 ID1 ID0
1
0
0
0
0
0
9
Device ID
1
0
0
0
0
Internal
Address
A1 A0
0
Internal
Address
A1 A0
1
0
0
I3
0
0
I3
Instruction
Opcode
I2
A1 A0
Internal
Address
Instruction
Opcode
I2
I1
I1 I0
I0
X9271
I3
RB RA
Register
Address
Instruction
Opcode
RB RA
Register
Address
I2
I1
P1
Pot/Bank
Address
P1
I0
P0
Pot/Bank
Address
P0
Data Register Bit [7:0] for all values of P1 and P0
Register
Address
Data Register Bit [7:0] for all values of P1 and P0
RB RA
These commands only valid when P1 = P0 = 0
WCR[7:0] valid only when P1 = P0 = 0;
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
WCR[7:0] valid only when P1 = P0 = 0;
X
P1
0
Pot/Bank
X
Address
P0
0
X
Don’t Care
X
or
or
X
X
X
X
March 31, 2005
FN8174.1