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25.2
Sound Generator Registers
The sound generator has the following five types of registers:
• Sound control register (SGCR)
• Frequency data register (SGFR)
• Amplitude data register (SGAR)
• Decrement grade register (SGDR)
• Tone count register (SGTR)
■ Sound Generator Registers
R/W
X
-
Figure 25.2-1 Overview on the Sound Generator Registers
bit
7
Address:
S1
00005E
H
R/W R/W R/W R/W
bit
15
00005F
H
Reserved
R/ W
bit
D7 D6 D5 D4 D3 D2
003546
H
R/W R/W R/W R/W
bit
15
003547
H
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W
bit
D7 D6 D5 D4 D3 D2
003548
H
R/W R/W R/W R/W
15
bit
003549
H
D7 D6 D5 D4 D3 D2
R/W R/W R/W R/W
:
Readable and writable
:
Undefined value
:
Undefined
6
5
4
3
2
1
S0 TONE OE2
OE1 INTE
INT
R/W
R/W
R/W R/W
14
13
12
11
10
-
-
-
-
-
BUSY DEC
-
-
-
-
-
R R/W
7
6
5
4
3
2
D1 D0
R/W
R/W
R/W R/W
14
13
12
11
10
9
D1 D0
R/W
R/W
R/W R/W
7
6
5
4
3
2
R/W
R/W
R/W R/W
14
13
12
11
10
9
D1 D0
R/W
R/W
R/W R/W
CHAPTER 25 SOUND GENERATOR
0
SGCR (lower)
ST
Initial value
0 0 0 0 0 0 0 0
B
9
8
SGCR (upper)
Initial value
0 X X X X X 0 0
1
0
SGFR
Initial value
X X X X X X X X
8
SGAR
Initial value
X X X X X X X X
1
0
SGDR
D1 D0
Initial value
X X X X X X X X
8
SGTR
Initial value
X X X X X X X X
B
B
B
B
B
535
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