si2401 Silicon Laboratories, si2401 Datasheet - Page 46

• Manufacturer Part Number: si2401
• Description: V.22bis Isomodem With Integrated Global Daa
• Manufacturer: Silicon Laboratories

Si2401
S0D (MF3). Modem Functions 3
Reset settings = 0000_0000 (0x00)
46
Name
Type
Bit
7
6
5
4
3
2
1
0
Bit
Reserved
Name
RBTS
INTP
EHR
EHB
EHE
EHI
RI
D7
Read returns zero.
Ring Indicator.
Specifies the functionality of pin3.
0 = Pin 3 functions as GPIO5 controlled by register SE1.
1 = Pin 3 functions as RI. RI asserts during a ring and negates when no
INT Polarity.
Specifies the polarity of the INT function on pin 11.
0 = An interrupt forces pin 11 low.
1 = An interrupt forces pin 11 high.
Ringback Tone Selector
Controls the unit step size for registers S19, S1A and S1B.
0 = 53.33 ms units. Necessary for detecting a ringback tone.
1 = 10 ms units. Necessary for detecting a reorder tone.
Enable Hangup on Reorder.
Modem is placed on-hook if a ringback or reorder tone is detected. See S0D[4].
0 = Disable.
1 = Enable.
Enable Hangup on Busy.
Modem is placed on-hook if a busy signal is detected.
0 = Disable.
1 = Enable.
Enable Hangup on Intrusion.
Modem is placed on-hook if parallel intrusion is detected.
0 = Disable.
1 = Enable.
Enable Hangup on Escape.
Modem is placed on-hook if a ESC signal is detected.
0 = Disable.
1 = Enable.
ring is present.
R/W
D6
RI
INTP
R/W
D5
Rev. 1.0
RBTS
R/W
D4
Function
EHR
R/W
D3
EHB
R/W
D2
R/W
EHI
D1
EHE
R/W
D0