Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 222)

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222 Rev. 1.3
7.7.8. Call—Automatic Pulse Dial
Table 140 lists the commands that occur after the configuration defined in Table 136.
7.7.9. Answer
A ring event will prompt the user to press the speakerphone button. This will generate a SP Button On Event and
the Speakerphone Configuration procedure defined in Table 136 on page 219 should be used to answer the call.
For ring detection and local ring tone/melody generation, see "7.6.2. TAM Hands-Free—Idle".
7.7.10. Handset Transition
For a SP Button Off Event (Handset Off-Hook), the voice driver should use the command sequence in Table 141 to
return to the Handset mode. Note the voice driver is responsible for tracking the handset hook switch state.
Table 140. Speakerphone Automatic Pulse Dial
Host to Modem
Commands / Data
Modem to Host Result
Codes/Data
Local Modem Actions
ATDP102 OK
Perform automatic pulse dial of 102. Modem will return
OK. The user will not receive <DLE> events for dial
tone, ring-back, busy, and quiet since the detectors are
disabled. See Table 122 on page 198 for details on
active detectors.
Table 141. Speakerphone to Handset Transition
Host to Modem Commands / Data
Modem to Host
Result Codes/
Data
Local Modem Actions
AT:U199|A OK
Mute the microphone and speaker paths to
the codec.
AT:U72,0110 OK
Configure Si3000 Register 1:
Enable speaker driver
Disable line output driver
Disable telephone instrument driver
Enable MBIAS output
AT:U72,05B3 OK
Configure Si3000 Register 5:
10 dB Line In gain
Mute Line In
20 dB MIC input gain
Enable MIC input
Mute telephone instrument input
Enable IIR filter
AT:U72,065C OK
Configure Si3000 Register 6:
0 dB RX PGA gain
Disable Line Out
Disable telephone instrument output
AT:U72,075E OK Configure Si3000 Register 7:
0 dB RX PGA gain
Enable SPKRL
Mute SPKRR