µPD9930
Table 2-4 Function Specification by Input/Output Amplifier Control Register
Register address
AMPCR
HEXNote
Microphone Accessory
Receiver
Accessory
Ringer output
Remarks
L
amplifier input amplifier amplifier 1 output amplifier
D7 D6 D5 D4 D3 D2 D1 D0
M
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
O
O
O
O
O
O
O
O
X
X
X
X
X
X
X
X
O
O
O
O
O
O
O
O
X
X
X
X
X
X
X
X
X
X
X
X
O
O
O
O
X
X
X
X
O
O
O
O
X
X
X
X
O
O
O
O
X
X
O
O
X
X
O
O
X
X
O
O
X
X
O
O
X
X
O
O
X
X
O
O
Stop
Output
Stop
00H 00H At reset
01H 80H
02H 40H
03H C0H
04H 20H
05H A0H
06H 60H
07H E0H
08H 10H
09H 90H
0AH 50H
0BH D0H
0CH 30H
0DH B0H
0EH 70H
0FH F0H
10H 08H
11H 88H
12H 48H
13H C8H
14H 28H
15H A8H
16H 68H
17H E8H
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Stop
Output
Note M: HEX value with MSB first
L: HEX value with LSB first
Remark O: Power up
X: Power down
15
NEC [ NEC ]
