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YMU757
#
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19-
These bits are used to setthe volum e ofeach source.The volum e setting consists of31 steps and mute function.Itis
possible to setat1dB intervals.Asthe defaultismuted,cancelthe mute function before proceeding to sound generation.
Also,to reduce the pow er,be sure to mute the volum e subjectto pow erreduction before shifting.
Relationsofregistersetting value and volum e.
V[4:0]
Volume(dB)
V[4:0]
Volume(dB)
V[4:0]
Volume(dB)
V[4:0]
Volume(dB)
00h
MUTE
08h
-23
10h
-15
18h
-7
01h
-30
09h
-22
11h
-14
19h
-6
02h
-29
0Ah
-21
12h
-13
1Ah
-5
03h
-28
0Bh
-20
13h
-12
1Bh
-4
04h
-27
0Ch
-19
14h
-11
1Ch
-3
05h
-26
0Dh
-18
15h
-10
1Dh
-2
06h
-25
0Eh
-17
16h
- 9
1Eh
-1
07h
-24
0Fh
-16
17h
- 8
1Fh
0
$38h
Power Management control
Default:001Eh
Index
b15
b14
b13
b12
b11
B10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
$38h
0
AP4
AP3
AP2
AP1
DP
Thissetting isused to reduce the pow erofeach function.Itispossible to control1 digitalsystem and 4 analog system s
independently.(Forthe details,please referto "Pow er-dow n controldivision diagram ".)
Setting allbitsto "1"willminimize the pow erofthe entire LSI.
DP :Use of"1"forthissetting willreduce the pow erofthe entire digitalsection.
AP1 :Use of"1"forthissetting willreduce the pow erofthe VREF circuitin the analog section.
AP2 :Use of"1" forthissetting willreduce the pow eron the non-inverted am plifierside ofthe FM volum e,speaker
volum e,equalizercircuitand speakeroutputsection.
AP3 :Use of"1"forthissetting willreduce the pow erofthe inverted am plifierside ofthe speakeroutputsection.
AP4 :Use of"1"forthissetting willreduce the pow erofthe DA C and earphone outputvolum e.
Afterinitialization,the pow erofthe analog section (AP1 to AP4)isreduced.