參數(shù)資料
型號: STLC7549
廠商: 意法半導(dǎo)體
元件分類: Codec
英文描述: Stereo Audio/MODEM/Telephony Codec(立體聲音頻/調(diào)制解調(diào)器/電話編解碼器)
中文描述: 立體聲音頻/調(diào)制解調(diào)器/語音編解碼器(立體聲音頻/調(diào)制解調(diào)器/電話編解碼器)
文件頁數(shù): 33/35頁
文件大?。?/td> 335K
代理商: STLC7549
REGISTERDESCRIPTION
(continued)
Index Register19 :
DigitalControl Register #1
7
6
5
4
3
2
1
0
D
D
D
D
+
+
C
C
DCVOL3-0 : Read only DC volume control value
(see +DCVOLbit for explanation).
+DCVOL
: Resetvalue :0. +EnableDCvolume
control circuitry. If the DCVOL bit is
enabled, the codec will use a DC
voltage range from a potentiometer
attached to the external chip pin
DC_POT to determine a 4-bit value
to be used as the main left/right
output attenuator register value.
Both left and right attenuation levels
have the same value.Regardless of
the setting of this DCVOL bit, this
4-bit value can be read by DSP
software since the 4-bit value is
reflected in the Register 19 (bits
[7:4]).TheDSPsoftwarecan usethis
4-bit value for unique functions.
Setting this bit to 1 will enable the
circuitry on the codec which permits
the externalpotentiometerto control
the main left/right output attenuator
register 4-bit valuein Register10.
+PBVOL
: Reset value: 0. +Enablepushbutton
volume circuitry. Setting this bit to 1
will enable the pushbutton digital
volumecontrolinputpinsto influence
the main left/right output attenuator
register values in Register 10. The
output attenuators have 16 possible
states and the VOL_UP and
VOL_DOWNinputpinswill make the
attenuatorregistervalueincrementor
decrement from 0 to 15. The
VOL_MUTE input pin will affect the
main left/right output mute blocks in
Register 11. When pushbuttons are
used,leftandRightattenuationlevels
canhavedifferentvalues.Regardless
of the value of this control bit, the
three digital input values of the UP,
DOWNand MUTE pins are reflected
in theSTATUSwordthatissenttothe
DSP onthe codecSOUT1 line.
: Resetvalue: 0.SettingthebitCALIBA
to 1 will force a calibration of all audio
convertersandthebit CALIBMto1will
force a calibration of all modem
converters.Thelengthoftimerequired
for calibrationis 23msmin. at44.1kHz
(section4of thefunctionaldescription)
andafterCALIBxisautomaticallyreset
to 0whencalibrationiscompleted.
If +DCVOL and +PBVOL areset to 1,the priorityis givento
+DCVOL.
CALIBA,
CALIBM
Note :
STLC7549
33/35
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