CS4205_05 Datasheet, PDF (28/81 Pages) Cirrus Logic – CrystalClear® Audio Codec ’97 for Portable Computing

CS4205
5.3 Mono Volume Register (Index 06h)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Mute 0
0
0
0
0
0
0
0
0 MM5 MM4 MM3 MM2 MM1 MM0
Mute
Mono Mute. Setting this bit mutes the MONO_OUT output signal.
MM[5:0]
Mono Volume Control. The MM[5:0] bits control the mono output volume. Each step corre-
sponds to 1.5 dB gain adjustment, with a total available range from 0 dB to -46.5 dB attenu-
ation. Setting the MM5 bit sets the mono attenuation to -46.5 dB by forcing MM[4:0] to a ‘1’
state. MM[5:0] will read back 011111 when MM5 has been ‘set’. See Table 4 on page 27 for
further attenuation levels.
Default
8000h. This value corresponds to 0 dB attenuation and Mute ‘set’.
5.4 Master Tone Control Register (Index 08h)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0 BA3 BA2 BA1 BA0 0
0
0
0 TR3 TR2 TR1 TR0
BA[3:0]
TR[3:0]
Default
Bass Control. The BA[3:0] bits are used to control the bass gain in the effects engine. Each
step corresponds to 1.5 dB gain adjustment, with a total available range from +10.5 dB to
-10.5 dB gain. See Table 5 for further details. The center frequency from which the gain is
measured defaults to 100 Hz for bass, and may be changed using the LPFS[1:0] bits in the
Signal Processing Engine Control Register (Index 6Eh, Address 08h).
Treble Control. The TR[3:0] bits are used to control the treble gain in the effects engine. Each
step corresponds to 1.5 dB gain adjustment, with a total available range from +10.5 dB to
-10.5 dB gain. See Table 5 for further details. The center frequency from which the gain is
measured defaults to 10 kHz for treble, and may be changed using the HPFS[1:0] bits in the
Signal Processing Engine Control Register (Index 6Eh, Address 08h).
0F0Fh. This value corresponds to bypass of bass and treble gain.
TR3..TR0
BA3..BA0
0000
0001
…
0110
0111
1000
...
1101
1110
1111
Gain
Level
+10.5 dB
+9 dB
...
+1.5 dB
0 dB
-1.5 dB
...
-9 dB
-10.5 dB
bypass
Table 5. Tone Control Values
28
DS489PP4