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