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

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