AN93

 

 

 

Table 56. Register U4D Bit Map

 

 

 

Bit

Name

Function

 

 

 

15

Reserved

Read returns zero.

 

 

 

14

TOCT

Turn Off Calling Tone.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

13

Reserved

Read returns zero.

 

 

 

12

NHFP

No Hook-Flash Pulse.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

11

NHFD

No Hook-Flash Dial.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

10

CLPD

Check Loop Current Before Dialing.

 

 

0

= Ignore.

 

 

1

= Check.

 

 

 

9

Reserved

Read returns zero.

 

 

 

8

FTP

Force Tone or Pulse.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

7

SPDM

Skip Pulse Dial Modifier.

 

 

0

= No.

 

 

1

= Yes.

 

 

 

6

Reserved

Read returns zero.

 

 

 

5

GT18

1800 Hz Guard Tone Enable (UK Guard Tone)

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

4

GT55

550 Hz Guard Tone Enable.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

3

CTE

Calling Tone Enable.

 

 

0

= Disable.

 

 

1

= Enable.

 

 

 

2

Reserved

Read returns zero.

 

 

 

1

Reserved

Read returns zero.

 

 

 

0

Reserved

Read returns zero.

 

 

 

 

104

Rev. 1.3

Page 104
Image 104
Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Register U4D Bit Map