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參數(shù)資料
| 型號： | MC145745 |
| 廠商： | Motorola, Inc. |
| 英文描述： | V.21/V.23 Telemeter Modem |
| 中文描述： | 遙測V.21/V.23調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 172K |
| 代理商： | MC145745 |
MC145745
12
MOTOROLA
Table 3. Function Mode Setup
Register
b3
b2
b1
b0
Comments
FSK Mode
0
0
0
0
The device works as one of two FSK modes, V.21/V.23.
FSK Loopback
0
0
0
1
The FSK modulator is internally connected to the FSK demodulator.
CPT Detect Mode
0
0
1
0
The device works as the 400 Hz tone detector.
Answer Tone
Transmission Mode
0
0
1
1
The device works as the 2100 Hz answer tone generator.
DTMF Transmission
Mode
0
1
0
0
The device works as the DTMF generator. The receiver is disabled.
Single Tone
Transmission Mode
0
1
0
1
The device outputs one of the eight tones used for DTMF.
Power Down 1
0
1
1
0
Whole circuits except for the SCP and the oscillator circuit are disabled.
Power Down 2
0
1
1
1
Whole circuits except for the SCP are disabled.
DTMF Reception Mode
1
0
0
0
The device works as the DTMF receiver. The received DTMF tone is
demodulated to the 4–bit code, then output from the SCP interface
and/or the parallel port.
DTMF Loopback
1
0
0
1
The DTMF generator is internally connected to the DTMF receiver, then
the DTMF code written in BR5 is loopbacked to the parallel port (PB0 –
PB3).
Table 4. Transmission Attenuator Range
Transmission
Attenuator Range
b3
b2
b1
b0
0 dB
0
0
0
0
– 1 dB
0
0
0
1
– 2 dB
0
0
1
0
– 3 dB
0
0
1
1
– 4 dB
0
1
0
0
– 5 dB
0
1
0
1
– 6 dB
0
1
1
0
– 7 dB
0
1
1
1
– 8 dB
1
0
0
0
– 9 dB
1
0
0
1
– 10 dB
1
0
1
0
– 11 dB
1
0
1
1
– 12 dB
1
1
0
0
– 13 dB
1
1
0
1
– 14 dB
1
1
1
0
– 15 dB
1
1
1
1
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