AD1816A

–28–

REV. A

[Base+9]

Capture Configuration

76543210

RES

CFMT [1:0]

CC/L

CST

CIO

CEN

RESET = [0x00]

CEN

(RW)

Capture Enable. This bit enables or disables data capture.

0

Disable

1

Enable

CIO

(RW) Capture Programmed I/O. This bit determines whether the capture data is transferred via DMA or PIO.

0

DMA

1

PIO

CST

(RW) Capture Stereo/Mono Select. This bit selects stereo or mono formatting for the input audio data streams.

In stereo, the Codec alternates samples between channels to provide left and right channel input. For mono,

the Codec captures samples on the left channel.

0

Mono

1

Stereo

CC/L

(RW) Capture Companded/Linear Select. This bit selects between a linear digital representation of the audio sig-

nal or a nonlinear, companded format for all output data. The type of linear PCM or the type of companded

format is defined by CFMT [1:0].

0

Linear PCM

1

Companded

CFMT [1:0]

(RW) Capture Format. Use these bits to select the format for capture data according to the following Table VI and

Figure 15.

[Base+10]

Reserved

76543210

RESERVED

RESET = [0xXX]

[Base+11]

Reserved

76543210

RESERVED

RESET = [0xXX]

[Base+12]

Joystick RAW DATA

76543210

Joystick Data [7:0]

RESET = [0xF0]

Joystick Data

(RO)

Joystick Data. Joystick Data (identical to LDN 2): Writes to this register are ignored.

[Base+13]

Joystick Control

76543210

JRDY

JWRP

JSEL [1:0]

JMSK [3:0]

RESET = [0xF0]

JMSK [3:0]

(RW) Joystick Axis Mask. JRDY bit calculated based on axes selected by JMSK only.

xxx1

Enable AX

xx1x

Enable AY

x1xx

Enable BX

1xxx

Enable BY

JSEL [1:0]

(RW) Joystick Select. Selects one of four joystick axis register sets according to the following table:

00

Read AX (16 Bits) from [Base+14] & [Base+15]

01

Read AY (16 Bits) from [Base+14] & [Base+15]

10

Read BX (16 Bits) from [Base+14] & [Base+15]

11

Read BY (16 Bits) from [Base+14] & [Base+15]

JWRP

(RW) Joystick Wrapmode. Continuous Joystick sampling mode—sampling automatically restarted every ~16 ms.

JRDY

(RO)

Joystick Ready. Sampling complete, joystick data ready for reading.

Note: Sampling must be started manually if JWRP is set before any sampling cycles are run. To start sampling after setting the JWRP

bit, write to the joystick port [Base+14].