CS4239 datasheet(44/98 Pages) CIRRUS

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Capture Data Format (I28)

Default = x0x0xxxx

rbc16B

rbcS/M

res

S/M

Stereo/Mono Select: This bit deter-

mines how the capture audio data

stream is formatted. Selecting stereo

will result with alternating samples

representing left and right audio

channels. Selecting mono only cap-

tures data from the left audio

channel. MCE (R0) or CMCE (I16)

must be set to modify S/M. See

Changing Audio Data Formats sec-

tion for more details.

0 - Mono

1 - Stereo

16B

selects between 8-bit unsigned and

16-bit signed data for capture. The

capture data format can be different

than the playback data format. MCE

(R0) or CMCE (I16) must be set to

modify this register. See

Changing

Audio Data Formats section for

more details.

0 - 8-bit unsigned data

1 - 16-bit signed data

Right Master Output Volume (I29)

Default = 00100011

ROM

ROS1

ROS0

ROG4

ROG3

ROG2

ROG1

ROG0

When Hardware Volume is enabled, VCEN in C8 or

X24 is set, this register will change based on external

buttons.

ROG4-ROG0

Right Output, ROUT, Master Gain.

ROG0 is the least significant bit and

represents -2 dB, with 00011 = 0 dB.

The span is nominally +6 dB to

-56 dB. See Table 9.

ROS1,0

Right Output Mixer Select. These bits

select and attenuation into the right

output Master Gain stage, ROG4-0.

00 - -16 dB

01 - 0 dB

10 - -8 dB

11 - -24 dB

ROM

Right Output Mute. When set to 1,

the right output, ROUT, is muted.

Capture Upper Base (I30)

Default = 00000000

CUB7

CUB6

CUB5

CUB4

CUB3

CUB2

CUB1

CUB0

CUB7-CUB0

Capture Upper Base: This register is

the upper byte which represents the

8 most significant bits of the 16-bit

Capture Base register. Reads from

this this register returns the same

value that was written.

Capture Lower Base (I31)

Default = 00000000

CLB7

CLB6

CLB5

CLB4

CLB3

CLB2

CLB1

CLB0

CLB7-CLB0

Lower Base Bits: This register is the

lower byte which represents the 8

least significant bits of the 16-bit

Capture Base register. Reads from

this register returns the same value

which was written.

DS253PP2

CS4239

CrystalClear Portable ISA Audio System

CS4239 Datasheet(PDF) 44 Page - Cirrus Logic

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