MT9196AS Zarlink Semiconductor, Inc., MT9196AS Datasheet - Page 27

• Manufacturer Part Number: MT9196AS
• Description: Integrated Digital Phone Circuit (IDPC)
• Manufacturer: Zarlink Semiconductor, Inc.

Programming Examples
Some examples of the programming steps required
to set-up various telephony functions are given. Note
Initialization
Description
choose ST-BUS vs SSI
or (ie SSI at 256kHz BCL)
power up oscillator and FDI
same as above with B2 channel for ST-BUS
A-Law vs -Law as required
or (ie CCITT A-Law and gains increased)
Standard Full-duplex handset call
Description
program Initialization steps above
set sidetone gain (ie 0 dB)
set gain (ie Rx = +3 dB, Tx = 0 dB)
select transmit path
or (ie handset mic for SSI)
select receive path
sidetone)
or (as above plus receive to AUXout also)
optional:
set Filter/CODEC Rx and Tx gain
Group Listening
Description
program Initialization steps above
set gain (ie Rx = +3 dB, Tx = 0 dB)
set sidetone gain (ie 0 dB) and also
set handsfree speaker gain independent
of the rest of the receive path (ie 12dB)
set high threshold level
set low threshold level
enable group listening with 12dB of atten.
select transmit path
or (ie handset mic for SSI)
select receive path
(ie Rx filter to both handset and
handsfree speakers with sidetone)
(ie CCITT -Law and gains low)
(ie handset mic to B2 for ST-BUS)
(ie handset speaker to Rx filter plus
(ie ST-BUS with C&D channels enabled)
(ie handset mic to B2 for ST-BUS)
Address
Address
Address
0Eh
0Eh
0Bh
0Ah
0Bh
1Dh
1Eh
1Ch
10h
10h
0Fh
0Fh
19h
12h
12h
13h
13h
19h
12h
12h
13h
that these steps are from the power-up reset default
definition. If some other state is currently true then
some programming steps may be omitted while new
ones may be required.
70h
05h
00h (other bits as required)
04h (other bits as required)
00h (default value so no write required)
2Ch
04h (leave speaker gain defaulted to 0dB)
89h (or as required, defaults = 0dB)
09h
01h
81h (for standard headset only)
91h
as required (0dB default)
89h (or as required, defaults = 0dB)
94h
as required or leave default value
as required or leave default value
A4h
09h
01h
85h
DATA
DATA
DATA
MT9196
7-161