BU26156RFS Datasheet, PDF (62/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
HPF2OD
This bit is to set number of high pass filter order(HPF2EN bit) for noise cut. In recording or
playback operation(RECPLAY≠0x0 ), do not change this bit. If this bit is changed, the noise may be generated.
HPF2OD
Description
0
second-order high pass filter
1
first-order high pass filter
Digital Volume Control Function Enable Register
MAPCON
INDEX
b07
b06
R
W
(Initial)
0x0
0x68 0x69
-
-
-
-
b05
b04
b03
b02
-
DVMUTE DVFADE
-
-
0
0
-
b01
b00
-
PALCEN
-
0
This register is to set ON or OFF for digital volume control function.
PALCEN
This bit is to set ON or OFF of limiter at playback.
Set this register at stop state. (RECPLAY=0x0)
Set PALCEN register’ value same as RPPL register (0xae/0xaf)
setting
Description
0
PALC OFF at playback
1
PALC ON at playback
DVFADE
This bit is to set ON or OFF of digital volume fade function. The fade function is effective for the recording and playback
digital volume and the equalizer gain.
setting
Description
Fade function OFF: The register setting value of RDATT, PDATT and EQGAIN0
0
to 3 is used actual volume value as it is. Therefore the value is effective
immediate.
1
Fade function ON: The volume is changing to the register setting value of
RDATT, PDATT and EQGAIN0 to 3 with 1 step per DVFCON register step time.
DVMUTE
This bit is to set MUTE of the digital volume. This mute function is effective for the recording digital volume at recording and
effective for playback digital volume at playback. The fade function by DVFADE is effective against the volume change by
this bit.
setting
Description
0
Register value of RDVOL and PDATT is effective.
Digital volume is set to MUTE.
1
Register value of RDVOL and PDATT cannot be changed by this bit, the
volume is resumed by releasing this bit(DVMUTE=0) to the original setting
value of RDVOL and PDVOL.
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TSZ22111・15・001
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TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001