MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 65

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

Advance Information
22.11 Tone Generation and Energy Detect Control Register (TEDC)
The Tone Generation and Energy Detect register controls the two tone ringers and both A and B energy detect
modules.
The TEDC register is configured as follows:
Of the 7 programmable tone generators the first two can be used to provide dual frequency squarewave ringing
signal. TRE1/WR1 and TRE2/WR2 are used to control Tone Ringer generator 1 and 2, respectively. Refer to
Tone Ringer description on page 44.
Each energy detect module monitors the signal for the selected incoming channel. Locations 71
CM are used to specify the incoming channel for EDA and EDB, respectively. An interrupt is generated and the
energy detect flag is set when the signal exceeds the threshold set in the Energy Detect A/B Low/High
Threshold register. A reset is performed by resetting the EDENA/B bit. During a reset the peak detector value
and energy detect flag are set to zero.
The Tone Generation circuit can be enabled with TGE bit set to 1. With the circuit reset there is no output
generated for all the 32 tones including the Tone Ringers and FSK transmitter output.
Read/Write Address is: 010
Reset Value is: 00
Bit
7
6
5
4
3
2
1
0
EDENB
EDENA
unused
Name
TRE2
TRE1
WR2
WR1
TGE
H
0 = Reset for Tone Generation Circuit. 1 = Enables Tone Generation. Tone
Generation must be enabled for FSK transmission and Tone Ringer operation.
Tone Ringer Enable bit. For Programmable Tone Generator 2.
1 = The tone ringer generator is enabled using the coefficients for programmable
tone generator 2 as well as the WR2 control bit.
0 = The tone ringer generator 2 is disabled. With Tone Ringer 2 disabled the 2nd
programmable Coefficients are used to generate DTMF signalling instead of the
squarewave ringing tone.
Warble Rate bit. For Programmable Tone Generator 2.
1 = The tone ringer circuit will toggle between the two programmed frequencies at a
5 Hz rate.
0 = The tone ringer warble rate is 10 Hz.
Tone Ringer Enable bit. For Programmable Tone Generator 1.
Warble Rate bit. For Programmable Tone Generator 1.
1 = Enable for Energy Detect B circuit.
1 = Enable for Energy Detect A circuit.
H
7
TGE
6
TRE2
5
WR2
4
TRE1
3
WR1
2
Description
ERB
1
ERA
0
MT90812
H
and 72
H
of
61