YMU757B Datasheet, PDF (17/43 Pages) YAMAHA CORPORATION – MA-1C

YMU757B
FL [2:0]
Modulation rate
0
1
2
3
4
5
6
7
0
π/16
π/ 8
π/ 4
π/ 2
π
2π
4π
Other control data
$30h Timbre allotment data
One melody consists of four parts and a timbre is allotted for each of these parts. Among the eight timbres registered
in the timbre data register, use four of them for each of these parts.
Default: 0000h
Index b15 b14 b13 b12 b11 b10
b9
b8
b7
$30h
0
V32
V31
V30
0
V22 V21 V20
0
b6
b5
b4
b3
V12 V11 V10
0
b2
b1
b0
V02 V01 V00
"x" in Vx[2:0] means the part No.
The timbre data used with Vx[2:0] are as follows.
Vx[2:0]
Timbre data to be used
0h
Timbre set for index 10 to 13h is used.
1h
Timbre set for index 14 to 17h is used.
2h
Timbre set for index 18 to 1Bh is used.
3h
Timbre set for index 1C to 1Fh is used.
4h
Timbre set for index 20 to 23h is used.
5h
Timbre set for index 24 to 27h is used.
6h
Timbre set for index 28 to 2Bh is used.
7h
Timbre set for index 2C to 2Fh is used.
$31h Tempo data
The "tempo" refers to the number of quarter notes reproduced in one minute. Use this setting to set the tempo of the
melody used when reproduced. The setting data is (8739/TEMPO)-1
Default: 0000h
Index b15 b14 b13 b12 b11 b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
$31h
0
0
0
0
0
0
0
0
T7
T6
T5
T4
T3
T2
T1 T0
$32h FM section control
Default: 0000h
Index b15 b14 b13 b12 b11 b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
$32h
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CLR ST
ST : This bit is used to control start/stop of the melody. Use "1" for the start setting and "0" for the stop setting.
CLR : This bit is used to initialize the entire LSI by the software. All the one except for " Timbre data register" of
Index10~2Fh are initialized. Bit CLR itself is not cleared when it is set as "1". Bit CLR should be written "0".
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