AK4955 Datasheet, PDF (89/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
Addr
0AH
Register Name
ALC Timer Select
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
FRN ZTM1 ZTM0 WTM2 WTM1 WTM0 RFST1 RFST0
R/W R/W R/W R/W R/W R/W R/W R/W
0
0
0
0
0
0
0
1
RFST1-0: ALC First Recovery Speed (Table 34)
Default: “01” (Quad Speed)
WTM2-0: ALC Recovery Waiting Period (Table 30)
Default: “000” (128/fs).
A period of recovery operation when any limiter operation does not occur during ALC operation
ZTM1-0: ALC Zero Cross Timeout Setting (Table 29)
Default: “000” (128/fs).
In case of the μP WRITE operation or ALC recovery operation, the volume is changed at zero crossing or
timeout.
FRN: ALC First Recovery Function Enable
0: Enable (default)
1: Disable
Addr
0BH
Register Name
ALC Mode Control 1
R/W
Default
D7
LFST
R/W
0
D6
ALC2
R/W
0
D5
ALC1
R/W
0
D4
ZELMN
R/W
0
D3
LMAT1
R/W
0
D2
LMAT0
R/W
0
D1
LMTH1
R/W
0
D0
LMTH0
R/W
0
LMTH1-0: ALC Limiter Detection Level / Recovery Counter Reset Level (Table 27)
Default: “00”
LMAT1-0: ALC Limiter ATT Step (Table 28)
Default: “00”
ZELMN: Zero Crossing Detection Enable at ALC Limiter Operation
0: Enable (default)
1: Disable
ALC1: ALC Enable for Recording
0: Recording ALC Disable (default)
1: Recording ALC Enable
ALC2: ALC Enable for Playback
0: Playback ALC Disable (default)
1: Playback ALC Enable
LFST: ALC Limiter operation when the output level exceed FS(Full-scale) level.
0: The volume is changed at zero crossing or zero crossing time out. (default)
1: When output of ALC is larger than FS, OVOL value is changed immediately (1/fs).
MS1343-E-00
- 89 -
2011/12