psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 127

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

4.3.3
Controlling of the generated tone follows the setting of the control bits ET (Enable Tone)
and PT (Pulsed Tone) and the CRAM parameters TON and TOFF corresponding table
14 and table 15.
Table 14 Control Generator
Table 15 CRAM Parameters of the Control Generator
Parameter
TON
TOFF
Four typical examples for the control generator programming are shown in Figure 65.
In the automatic stop mode (TGCR.SM = ’1’) the selected tone sequence is only stopped
after a sequence is completed. This avoids unpleasant sounds when stopping the tone
generator.
The tone signal can be fed directly to the input of the loudspeaker amplifier by setting the
TGSR.TRL bit to ’1’. In this mode only a square wave (fixed amplitude of VDD) is
available from the signal generators (F1, F2, F3)and the TGCR.SQTR bit has no effect.
Data Sheet
ET
0
0
1
1
PT
0
1
0
1
Control Generator
# of CRAM
Bytes
2
2
Generator Output
No tone
the tone is pulsed with the programmable parameters
TON, TOFF
continuous tone generation without breaks
the tone is pulsed with the programmable parameters
TON, TOFF
Range
20 ms to 16 min
20 ms to 16 min
117
Comment
Period while the tone generator
is turned on
Period while the tone generator
is turned off
PSB 21391
PSB 21393
2001-03-07
Codec