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MB96300 Super Series Hardware Manual
28.2
Sound Generator Registers
The Sound Generator has the following registers:
• Sound Control Register (SGCRn)
• Frequency Data Register (SGFRn)
• Amplitude Data Register (SGARn)
• Decrement Grade Register (SGDRn)
• Tone Count Register (SGTRn)
■ Sound Generator registers
R/W
: Readable and writable
R
: Read-only (write has no effect)
X
: Undefined value
-
: Undefined
Note:
The Sound Generator Control Register SGCRn can be accessed as a 16-bit register or as two 8-bit registers SGCRHn and
SGCRLn.
Figure 28.2-1 Overview of Sound Generator registers
1 5
1 4
RESV
-
R/W
-
7
6
S1
S0
TONE OE2
R/W
R/W R/W R/W R/W R/W R/W R/W
7
6
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W R/W R/W R/W R/W
7
6
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W R/W R/W R/W R/W
7
6
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W R/W R/W R/W R/W
7
6
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W R/W R/W R/W R/W
CHAPTER 28 SOUND GENERATOR
1 3
1 2
1 1
1 0
9
8
-
-
-
FSEL BUSY DEC
-
-
-
R/W
R
R/W
5
4
3
2
1
0
OE1 INTE
INT
ST
5
4
3
2
1
0
SGARn
Initial value
D1 D0
X X X X X X X X
5
4
3
2
1
0
SGFRn
Initial value
D1 D0
X X X X X X X X
5
4
3
2
1
0
SGTRn
Initial value
D1 D0
X X X X X X X X
5
4
3
2
1
0
SGDRn
Initial value
D
D0
1
X X X X X X X X
SGCRHn
Initial value
X X X X X 1 0 0
H
SGCRn
SGCRLn
Initial value
0 0 0 0 0 0 0 0
H
H
H
H
H
709
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