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Chapter 42 Sound Generator
3.Registers
3. Registers
7 6 5 4 3 2 1 0
TST DEC
SGCRL
(R/W) (R/W) (R/W) (R/W)
(0) (0) (0) (0)
Bit number
Sound Control register
Address: 000199H
Read/write
Initial value
15 14 13 12 11 10 9 8
S1
S0
TONE INTE INT ST
SGCRH
Bit number
Read/write
Initial value
Address: 000198
H
15 14 13 3 2 1 0
D15
D14 D13 D3 D2 D1 D0
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(X) (X) (X) (X) (X) (X) (X) (X)
SGFR
Bit number
Read/write
Initial value
Frequency Data register
Address: 00019A
H
15 14 13 12 11 10 9 8
D7 D6 D5 D4 D3 D2 D1 D0
SGAR
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(0) (0) (0) (0) (0) (0) (0) (0)
Bit number
Read/write
Initial value
Amplitude Data register
Address: 00019CH
(R/W)
(0)
(R)
(0)
(0)
(R/W)
7 6 5 4 3 2 1 0
SGDR
Bit number
Read/write
Initial value
Decrement Grade register
Address: 00019FH
15 14 13 12 11 10 9 8
SGTR
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(X) (X) (X) (X) (X) (X)
Bit number
Read/write
Initial value
Tone Count register
Address: 00019E
H
BUSY
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(X) (X) (X) (X) (X) (X) (X) (X)
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
(R/W) (R/W)
(X) (X)
S2
(R/W)
(0)
(R/W)
(0)
(R/W)
(0)