AD73322AST datasheet(20/43 Pages) AD

20 / 43 page

AD73322

–20–

REV. B

Table XII. Control Register Map

Address (Binary)

Name

Description

Type

Width

Reset Setting (Hex)

000

CRA

Control Register A

R/W

0x00

001

CRB

Control Register B

R/W

0x00

010

CRC

Control Register C

R/W

0x00

011

CRD

Control Register D

R/W

0x00

100

CRE

Control Register E

R/W

0x00

101

CRF

Control Register F

R/W

0x00

110

CRG

Control Register G

R/W

0x00

111

CRH

Control Register H

R/W

0x00

Table XIII. Control Word Description

8765

4321

C/D

R/W

Device Address

Control

Frame

Description

Bit 15

Control/Data

When set high, it signifies a control word in Program or Mixed Program/Data Modes. When

set low, it signifies a data word in Mixed Program/Data Mode or an invalid control word in

Program Mode.

Bit 14

Read/Write

When set low, it tells the device that the data field is to be written to the register selected by

the register field setting provided the address field is zero. When set high, it tells the device

that the selected register is to be written to the data field in the input serial register and that

the new control word is to be output from the device via the serial output.

Bits 13–11

Device Address

This 3-bit field holds the address information. Only when this field is zero is a device se-

lected. If the address is not zero, it is decremented and the control word is passed out of

the device via the serial output.

Bits 10–8

This 3-bit field is used to select one of the eight control registers on the AD73322.

Bits 7–0

This 8-bit field holds the data that is to be written to or read from the selected register

provided the address field is zero.

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