AN349

Rev. 0.1

7

3. Software Configuration

3.1. Registers

The control and status of the device is obtained through bitfields within 16 registers of 16 bits each. The

functionality of the bits can be separated into two main categories: control and status. The control bits can be

further subdivided into categories of when or how they are used (see Table 1). While the status bits can be

classified as static, static after power up, or dynamic after power up (see Table 2). Note that the Si4708/09 does

not offer GPIO1 or GPIO3.

Table 1. Register Use

Bit(s)

Hardware Control

General

Config

Regional

Config

End User

Adjustable

Seek

Tune

DISABLE

X

ENABLE

X

AHIZEN

X

GPO

X

RDSIEN

X

STCIEN

X

BLNDADJ

X

DSMUTE

X

SMUTER

X

SMUTEA

X

VOLEXT

X

SEEKTH

X

SKSNR

X

SKCNT

X

RDSPRF

X

RDSM

X

RDS

X

DE

X

BAND

X

SPACE

X

DMUTE

X

MONO

X

VOLUME

X

SEEKUP

X

SKMODE

X

SEEK

X

TUNE

X

CHAN

X