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CAT5261_13 Datasheet, PDF (9/14 Pages) ON Semiconductor – Dual Digital Potentiometer (POT)
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CAT5261
Instructions
Five of the ten instructions are three bytes in length. These
instructions are:
 Read Wiper Control Register – read the current
wiper position of the selected potentiometer in the
WCR
 Write Wiper Control Register – change current
wiper position in the WCR of the selected
potentiometer
 Read Data Register – read the contents of the
selected Data Register
 Write Data Register – write a new value to the
selected Data Register
 Read Status – Read the status of the WIP bit which
when set to “1” signifies a write cycle is in progress.
Table 13. INSTRUCTION SET
Instruction Set
Instruction
WCR1/
I3 I2 I1 I0 R1 R0
P1
Read Wiper Control
1001 0
0
1/0
Register
Write Wiper Control
1010 0
0
1/0
Register
Read Data Register
1 0 1 1 1/0 1/0
1/0
Write Data Register
1 1 0 0 1/0 1/0
1/0
XFR Data Register to 1 1 0 1 1/0 1/0
1/0
Wiper Control
Register
XFR Wiper Control
Register to Data
Register
1 1 1 0 1/0 1/0
1/0
Global XFR Data
0 0 0 1 1/0 1/0
0
Registers to Wiper
Control Registers
Global XFR Wiper
1 0 0 0 1/0 1/0
0
Control Registers to
Data Register
Increment/Decrement 0 0 1 0 0
0
1/0
Wiper Control Register
Read Status (WIP bit) 0 1 0 1 0
0
0
NOTE: 1/0 = data is one or zero
WCR0/
P0
1/0
1/0
1/0
1/0
1/0
1/0
0
0
1/0
1
Operation
Read the contents of the Wiper Control Register
pointed to by P1−P0
Write new value to the Wiper Control Register
pointed to by P1−P0
Read the contents of the Data Register pointed
to by P1−P0 and R1−R0
Write new value to the Data Register pointed to
by P1−P0 and R1−R0
Transfer the contents of the Data Register
pointed to by P1−P0 and R1−R0 to its
associated Wiper Control Register
Transfer the contents of the Wiper Control
Register pointed to by P1−P0 to the Data
Register pointed to by R1−R0
Transfer the contents of the Data Registers
pointed to by R1−R0 of all four pots to their
respective Wiper Control Registers
Transfer the contents of both Wiper Control
Registers to their respective data Registers
pointed to by R1−R0 of all four pots
Enable Increment/decrement of the Control
Latch pointed to by P1−P0
Read WIP bit to check internal write cycle status
The basic sequence of the three byte instructions is
illustrated in Figure 7. These three-byte instructions
exchange data between the WCR and one of the Data
Registers. The WCR controls the position of the wiper. The
response of the wiper to this action will be delayed by tWRL.
A transfer from the WCR (current wiper position), to a Data
Register is a write to non-volatile memory and takes a
minimum of tWR to complete. The transfer can occur
between one of the potentiometers and one of its associated
registers; or the transfer can occur between both
potentiometers and one associated register.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 6. These instructions
transfer data between the host/processor and the CAT5261;
either between the host and one of the data registers or
directly between the host and the Wiper Control Register.
These instructions are:
 XFR Data Register to Wiper Control Register −
This transfers the contents of one specified Data
Register to the associated Wiper Control Register.
 XFR Wiper Control Register to Data Register −
This transfers the contents of the specified Wiper
Control Register to the specified associated Data
Register.
 Global XFR Data Register to Wiper Control
Register − This transfers the contents of all specified
Data Registers to the associated Wiper Control
Registers.
 Global XFR Wiper Counter Register to Data
Register − This transfers the contents of all Wiper
Control Registers to the specified associated Data
Registers.
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