TS7514 查看數據表（PDF） - STMicroelectronics

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TS7514

PROGRAMMABLE V.23 MODEM WITH DTMF

STMicroelectronics 

TS7514

RECEIVE CHANNEL PROGRAMMING REGISTER (RPRX REGISTER)

Address

Data

D7 D6 D5 D4 D3 D2 D1 D0

Configuration

P 1 1 1 X X 0 X Low Frequency Wide Band Selected (Figure 7b) (Note 1)

X X 1 X Low Frequency Narrow Band Selected (Figure 7c)

X X X 0 Carrier Level Detector Delay Enabled*

X X X 1 Carrier Level Detector Delay Disabled.

Note 1 : In active tone detection mode (MOD/DTMF = Ø, MC/BC = 1, RTS = 1 see op. modes),

The low frequency wide band is automatically selected for the receive channel, whatever the RPRX register programming value.

After a switch back to modem mode (MOD/DTMF = 1, MC/BC = Ø or 1) the RPRX register indicates again the value programmed

before the active tone detection mode.

INPUT SHIFT REGISTER ACCESS

Figure 5 : 1st Case : Programmation without Data Transmission

1

2

RTS

3

6

4

4

5

9

MC/BC and MOD/DTMF

7

8

TxD or PRD

Figure 6 : 2nd Case : Programmation with TxD During Data Transmission

RTS

MC/BC and

MOD/DTMF

6

11 11

5

10

TxD or PRD

Data

n1

Data

n

D0

D7

Data

n

10/19

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