X9428WPI datasheet(5/20 Pages) XICOR

5 / 20 page

X9428

Characteristics subject to change without notice.

5 of 20

REV 1.1.5 7/8/03

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The Increment/Decrement command is different from

the other commands. Once the command is issued

and the X9428 has responded with an acknowledge,

the master can clock the selected wiper up and/or

down in one segment steps; thereby, providing a ﬁne

tuning capability to the host. For each SCL clock pulse

(tHIGH) while SDA is HIGH, the selected wiper will

move one resistor segment towards the VH/RH

terminal. Similarly, for each SCL clock pulse while SDA

is LOW, the selected wiper will move one resistor

segment towards the VL/RL terminal. A detailed

illustration of the sequence and timing for this

operation are shown in Figures 5 and 6 respectively.

Table 1. Instruction Set

Note:

(7) 1/0 = data is one or zero

Instruction

Instruction Set

Operation

I0 R1 R0

Read Wiper Counter

Read the contents of the Wiper Counter Register

Write Wiper Counter

Write new value to the Wiper Counter Register

Read Data Register

1/0

Read the contents of the Data Register pointed to

by R1–R0

Write Data Register

1/0

Write new value to the Data Register pointed to by

R1–R0

XFR Data Register to

Wiper Counter Register

1/0

Transfer the contents of the Data Register pointed

to by R1–R0 to its Wiper Counter Register

XFR Wiper Counter

1/0

Transfer the contents of the Wiper Counter Register

to the Data Register pointed to by R1–R0

Increment/Decrement

Wiper Counter Register

1/0

Enable Increment/decrement of the Wiper Counter

Figure 3. Two-Byte Instruction Sequence

0101

SCL

SDA

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