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參數(shù)資料
| 型號： | U3900BM-AFNG3 |
| 英文描述： | Programmable Telephone Audio Processor |
| 中文描述： | 程控電話音頻處理器 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大小： | 762K |
| 代理商： | U3900BM-AFNG3 |
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U3900BM
Rev. A2, 25-Aug-98
Target Specification
18 (34)
Register
Group
No
Name
Description
Status
R12
DTMF
R12B0
DTMFF0
DTMF frequency selection
0
R12B1
DTMFF1
DTMF frequency selection
0
R12B2
DTMFF2
DTMF frequency selection
0
R12B3
DTMFF3
DTMF frequency selection
0
R12B4
DTMFF4
DTMF frequency selection
0
R12B5
DTMFM0
Generator mode selection
0
R12B6
DTMFM1
Generator mode selection
0
R12B7
DTMFM2
Generator mode selection
0
R13
CLK
R13B0
CLK0
Selection clock frequency for
mC
0
RTH
R13B1
CLK1
Selection clock frequency for
mC
0
TM
R13B2
RTH0
Ringer threshold adjustment LSB
0
R13B3
RTH1
Ringer threshold adjustment
0
R13B4
RTH2
Ringer threshold adjustment
0
R13B5
RTH3
Ringer threshold adjustment MSB
0
R13B6
TME0
Test mode enable (low active)
0
R13B7
TME1
Test mode enable (high active)
0
R14
TM
R14B0
TME2
Test mode enable (high active)
0
CLID
R14B1
TME3
Test mode enable (low active)
0
R14B2
0
R14B3
0
R14B4
ENRXCL
Selection of internal CLID input signals
0
R14B5
GSCWID
Gain adjustment of SCWID behind sidetone
0
R14B6
WP
Wetting pulse
0
R14B7
0
R15
CLID
R15B0
UGT0
SCWID up guard time
0
R15B1
UGT1/SCD
SCWID up guard time/ CLIB special carier detect
0
R15B2
DGT0/CDLF0
SCWID down guard time/ CLID LF carrier detect
0
R15B3
DGT1/CDLF1
SCWID down guard time/ CLID LF carrier detect
0
R15B4
EGT0/CDHF0
SCWID early guard time/ CLID HF carrier detect
0
R15B5
EGT1/CDHF1
SCWID early guard time/ CLID HF carrier detect
0
R15B6
FDD
Filter drop duration
0
R15B7
FDC
Filter drops count
0
8
Power-on Reset
To avoid undefined states of the system when it is
powered on, an internal reset clears the internal registers.
The system (U3900BM + microcontroller) is woken up
by any of the following conditions:
VMP > 2.75 V and VB > 2.45 V
and
line voltage (VL)
or
ringer (VRING)
or
external supply (ES)
The power-down of the circuit is caused by a shut-down
sent by the serial bus (SD = 1), low-voltage reset or by the
watchdog function (see figures 16, 17 and 18).
9
Watchdog Function
To avoid the system operating the microcontroller in a
wrong condition, the cicuit provides a watchdog function.
The watchdog has to be retriggered every second by
triggering the serial bus (sending information to the IC or
other remoted components at the serial bus). If there has
been no bus transmission for more than one second the
watchdog iniates a reset.
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