X9250
Figure 8. Increment/Decrement Timing Limits
t
WRID
SCK
SI
V
W
/R
W
INC/DEC CMD Issued
Voltage Out
Table 1. 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
Global XFR Data Register
to Wiper Counter Register
Global XFR Wiper Counter
Register to Data Register
Increment/Decrement
Wiper Counter Register
Read Status (WIP bit)
I
3
1
1
1
1
1
I
2
0
0
0
1
1
Instruction Set
I
1
I
0
R
1
R
0
0
1
1
0
0
1
0
1
0
1
0
0
R
1
R
1
R
1
R
1
R
1
R
1
0
0
0
0
R
0
R
0
R
0
R
0
R
0
R
0
0
0
P
1
P
1
P
1
P
1
P
1
P
1
P
1
0
P
0
P
0
P
0
P
0
P
0
P
0
P
0
0
Operation
Read the contents of the Wiper Counter
Register pointed to by P
1
-P
0
Write new value to the Wiper Counter
Register pointed to by P
1
-P
0
Read the contents of the Data Register
pointed to by P
1
-P
0
and R
1
–R
0
Write new value to the Data Register pointed
to by P
1
-P
0
and R
1
–R
0
Transfer the contents of the Data Register
pointed to by R
1
–R
0
to the Wiper Counter
Register pointed to by P
1
-P
0
Transfer the contents of the Wiper Counter
Register pointed to by P
1
-P
0
to the Register
pointed to by R
1
–R
0
Transfer the contents of the Data Registers
pointed to by R
1
–R
0
of all four pots to their
respective Wiper Counter Register
Transfer the contents of all Wiper Counter
Registers to their respective data Registers
pointed to by R
1
–R
0
of all four pots
Enable Increment/decrement of the Wiper
Counter Register pointed to by P
1
-P
0
Read the status of the internal write cycle,
by checking the WIP bit.
1
1
1
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
0
0
1
P
1
0
P
0
1
REV 1.1.5 1/31/03
www.xicor.com
Characteristics subject to change without notice.
7 of 21
XICOR [ XICOR INC. ]
