X9271 Datasheet, PDF (10/22 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

X9271
Figure 5. Increment/Decrement Instruction Sequence
CS
SCL
SI
0 1 0 1 00
00
ID3 ID2 ID1 ID0 0 0 A1 A0
I3 I2 I1 I0 RA RB ^P1 P0
II
ID
D
NN
NE
E
Device ID
Internal
Address
Instruction
Opcode
Register
Address
Pot/Bank
Address
C
1
C
2
CC
n1
C
n
Figure 6. Increment/Decrement Timing Limits
SCK
tWRID
SI
VW
VOLTAGE OUT
INC/DEC CMD ISSUED
Table 6. Instruction Set
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)
Instruction Set
I3 I2 I1 I0 RB RA P₁ P₀
Operation
1 0 0 1 0 0 0 1/0 Read the contents of the Wiper Counter
Register
1 0 1 0 0 0 0 1/0 Write new value to the Wiper Counter
Register
1 0 1 1 1/0 1/0 1/0 1/0 Read the contents of the 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 the Data Register
pointed to by P1 - P0 and RB - RA
1 1 0 1 1/0 1/0 0
0 Transfer the contents of the Data Register
pointed to by RB - RA (Bank 0 only) to the
Wiper Counter Register
1 1 1 0 1/0 1/0 0
0 Transfer the contents of the Wiper Counter
Register to the Register pointed to by RB-RA
(Bank 0 only)
0 0 1 0 0 0 0 0 Enable Increment/decrement of the Wiper
Counter Register
0 1 0 1 0 0 0 1 Read the status of the internal write cycle, by
checking the WIP bit.
Note: 1/0 = data is one or zero
10
FN8174.1
March 31, 2005