RCVDL56DPFL/SP, RCV56DPFL/SP, and RCV336DPFL/SP Designer’s Guide
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13-1
13. SPEAKERPHONE CONFIGURATION
The Speakerphone Configuration Code (CONF) is ACh.
To configure for speakerphone operation:
1. Set CONF = ACh.
2. Set SP/HS = 1.
3. Reset MuteSp and MuteMic.
4. Adjust VMicLVL and VOLUME bit fields as desired.
5. Dial or answer.
6. If needed, adjust volume using VOLUP and VOLDWN.
13.1 INTERFACE MEMORY REGISTERS
The speakerphone registers are:
Register
7
6
5
4
3
2
1
0
14
SpDTMF
TonSpkE
TonLinE
—
—
SpRIEn
MMicLVL
13
—
VOLUP
VOLDWN
SP/HS
MuteSp
MuteMic
VMicLVL
Note: The speakerphone registers are shared with other data-mode definitions.
SP/HS controls the speakerphone mode of operation. When SP/HS = 1, full-duplex operation is enabled. Conversely, when
SP/HS = 0, the data pump functions in “handset” mode. In handset mode, the AGCs are frozen, the cross-correlator is
disabled, and the acoustic echo canceller is “bypassed.” The input from the voice IA is switched to come from TELIN and the
output to the voice IA is sent to TELOUT.
13.1.1 DTMF and Dual Tone Modes
DTMF dialing can be sent to the line (DTMF = 1) and/or to the speaker (SpDTMF = 1) (see Table 13-1).
The dial digit is sent by writing to TBUFFER (similar to how it is done in mode 81h). To send a DTMF digit, write its number
into TBUFFER. For example, to send the DTMF digit "4" to both the line and the speaker, set both SpDTMF and DTMF = 1
and then write a 04 into TBUFFER.
Table 13-1. DTMF Routing
DTMF
ToneLinE
Dual Tone Mode
SpDTMF
ToneSpkE
Dual Tone Mode
1
x
DTMF dialing to the line
1
x
DTMF dialing to the speaker
0
1
Dual Tone (using RTS)
0
1
Dual Tone (using DTR)
0
0
No tones
0
0
No tones
The dual tone parameters addresses are listed in Table 13-2.
Table 13-2. Dual Tone Frequency Parameters
Dual Tone Function
Address (Hex)
Line Dual Tone 1 Amplitude
868
Line Dual Tone 1 Frequency
968
Line Dual Tone 2 Amplitude
869
Line Dual Tone 2 Frequency
969
Number of Line Tones -1
B68
Speaker Dual Tone 1 Amplitude
86A
Speaker Dual Tone 1 Frequency
96A
Speaker Dual Tone 2 Amplitude
86B
Speaker Dual Tone 2 Frequency
9BF
Number of Speaker Tones -1
B6A
Summary of Contents for RC336DPFL
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