MC145745FW Просмотр технического описания (PDF) - Motorola => Freescale

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MC145745FW

V.21/V.23 Telemeter Modem

Motorola => Freescale 

SCP REGISTER MAP

The MC145745 register map is shown in Table 2. Seven of

the 4–bit wide byte registers (BR) are provided in the register

block. According to these published specifications, BR signi-

fies each register and the address of SCP data. R/W is the

read/write register, and RO is read only. If there is a high to

low pulse on the RESET pin or the power supply turns off,

this register returns to the default state.

The default condition that occurs after a power reset is as

follows.

BR0 V.23 Receive, Transmit Enable

BR1 DTMF CDON = 30 ms, DTMF CDOFF = 25 ms

FSK CDON = 450 ms, FSK CDOFF = 30 ms

BR2 FSK Mode

BR3 AGC Range = Maximum,

Carrier Detect Level: High

BR4 Transmission Gain = Maximum

BR5 DTMF Transmission: 941 Hz + 1633 Hz

BR6 DTMF Reception: Unknown

Table 2. SCP Register Map

Register

b3 (Bit 3: MSB)

b2 (Bit 2)

b1 (Bit1)

b0 (Bit 0: LSB)

BR0 (R/W)

Modem Choice

FSK Channel

0 V.23

V.21: Answer

V.23: Receive

1 V.21

V.21: Originate

V.23: Transmit

BR1 (R/W)

FSK CDT2

FSK CDT1

TCDON

b3=0, b2=0 : 450 ms

b3=0, b2=1 : 15 ms

b3=1, b2=0 : 15 ms

b3=1, b2=1 : 75 ms

TCDOFF

b3=0, b2=0 : 30 ms

b3=0, b2=1 : 30 ms

b3=1, b2=0 : 15 ms

b3=1, b2=1 : 10 ms

BR2 (R/W) (see Table 3)

Function Mode 4

Function Mode 3

BR3 (R/W)

AGC Range 2

AGC Range 1

0 B3=0, b2=0 : – 5 to + 20 dB

B3=0, b2=1 : – 5 to + 15 dB

1 b3=1, b2=0 : – 5 to + 10 dB

b3=1, b2=1 : – 5 to + 5 dB

BR4 (R/W) (see Table 4)

Transmission Gain 4

Transmission Gain 3

BR5 (R/W) (see Table 5)

Tone Transmission 4

Tone Transmission 3

BR6 (RO) (see Table 5)

DTMF Reception 4

DTMF Reception 3

NOTES:

1. BR0 (b0) is a non–working bit.

2. DTMF Loopback data is entered into BR5 and output from the parallel port.

Transmission Enable

Enable

Disable

DTMF CDT2

TCDON

b1=0, b0=0 : 30 ms

b1=0, b0=1 : 35 ms

b1=1, b0=0 : 45 ms

DTMF CDT1

TCDOFF

b1=0, b0=0 : 25 ms

b1=0, b0=1 : 35 ms

b1=1, b0=0 : 25 ms

Function Mode 2

Function Mode 1

Carrier Detect Level 1 Test

High Level

(Set when VCC = 5 V)

Low Level

(Set when VCC = 3.6 V)

Transmission Gain 2

Normal

Test Mode

Transmission Gain 1

Tone Transmission 2

Tone Transmission 1

DTMF Reception 2

DTMF Reception 1

MOTOROLA

MC145745

11

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