CMX867A データシートの表示（PDF） - CML Microsystems Plc
部品番号
コンポーネント説明
一致するリスト
CMX867A Datasheet PDF : 8 Pages
| |||
Calling
Modem
Set-up Tx & Rx
Mode Registers
Take Off-Hook
Start 5s timer
Dial tone N
detected ?
Y
V.25
Dial digits to line.
Start 40 second
timer
N
Answertone
detected ?
Y
Wait for Answertone
to disappear
N
Unscrambled
1 detected for
Y 145ms?
CONTINUED
Figure 2
N
5s timer expired ?
Y
Error
N
40s Timer
expired ?
Y
Error
Set-up Registers
Tx Mode ($E1)
b15..b12 = 0001 (select DTMF / Tones mode)
b11..b9 = user defined (Tx level)
Rx Mode ($E2)
b15..b12 = 0001 (select DTMF / Tone mode)
b11..b9 = user defined (Rx level)
Take Off-Hook
General Control ($E0)
b9 = 1 (Relay drive pin pulled to Vss)
b5 = 0 (Mask Ring Detect IRQ)
Note:- If blind dialling then wait 3 seconds before jumping
to the section below headed "Dial digits to line (DTMF)".
Start a 5 second timer.
Dial Tone Detect (before 5s timer expires)
At this point only the dial tone (or possibly busy tone) should
be heard, (country dependent).
General Control ($E0)
b2 = 1 (unmask Call Progress Energy detect IRQ)
Status ($E6)
On interrupt, monitor b10 for Call Progress
Energy. If CP energy detected within 5 secs,
check whether dial tone (continuous CP energy)
or busy tone (interrupted CP energy) is present.
Dial digits to line (DTMF)
Tone cadence of 100ms on and 100ms off (country
dependent) is suggested.
General Control ($E0)
b2 = 0 (mask Call Progress Energy IRQ)
Tx Mode ($E1)
b4 = 1 (for DTMF generation)
{ b3..b0 = user defined (digits to be dialled)
TToonnee OONFF b4..b0 = 00000 (select No Tone)
Start 40s timer
Detect Answer Tone (before 40s timer expires)
Rx Mode ($E2)
b2..b0 = 010 (Answertone detect mode)
General Control ($E0)
b1 = 1 (unmask 2100Hz Answertone IRQ)
Status ($E6)
On interrupt, monitor bit 7 for 2100Hz
Answertone.
Wait for Answertone to disappear.
Detect Unscrambled 1s for 145ms
The 2225Hz Answertone detector will also trigger on
unscrambled 1s.
General Control ($E0)
b1 = 0 (mask 2100Hz Answertone IRQ)
b0 = 1(unmask 2225Hz Answertone IRQ)
Status ($E6)
On interrupt, monitor bit 6 for 2225Hz
Answertone which shows that unscrambled 1s
are being received. Check that unscrambled 1s
are received for at least 145ms.
Share Link: 