MT9094 View Datasheet(PDF) - Mitel Networks
Part Name
Description
MFG CO.
MT9094 Datasheet PDF : 32 Pages
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MT9094
Watchdog
To maintain program integrity an on-chip watchdog
timer is provided for connection to the
microcontroller reset pin. The watchdog output WD
(pin 17) goes high while the DPhone-II is held in
reset via the PWRST (pin 6). Release of PWRST will
cause WD to return low immediately and will also
start the watchdog timer. The watchdog timer is
clocked on the falling edge of F0i and requires only
this input, along with VDD, for operation.
If the watchdog reset word is written to the watchdog
register (address 11h) after PWRST is released, but
before the timeout period (T=512mSec) expires, a
reset of the timer results and WD will remain low.
Thereafter, if the reset word is loaded correctly at
intervals less than 'T' then WD will continue low. The
first break from this routine, in which the watchdog
register is not written to within the correct interval or
it is written to with incorrect data, will result in a high
going WD output after the current interval 'T' expires.
WD will then toggle at this rate until the watchdog
register is again written to correctly.
5-BIT WATCHDOG RESET WORD
XX
x=don’t care
W4 W3 W2 W1 W0
X01010
Test Loops
Detail LBio and LBoi Loopback Register (address
16h)
LBio
LBoi
Setting this bit causes data on DSTi to
be looped back to DSTo directly at the
pins. The appropriate channel enables
Ch1EN -Ch3EN must also be set.
Setting this bit causes data on DSTo to
be looped back to DSTi directly at the
pins.
Address
(Hex)
00-09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17-1C
1D
1E
1F
20
21
22
23
24
25
26
27-3F
DPhone-II Register Map
WRITE
RESERVED
FCODEC GAIN CONTROL REGISTER 1
FCODEC GAIN CONTROL REGISTER 2
RESERVED
RESERVED
TRANSDUCER CONTROL REGISTER
GENERAL CONTROL REGISTER
RESERVED
WATCHDOG REGISTER
LCD SEGMENT ENABLE REGISTER 1
LCD SEGMENT ENABLE REGISTER 2
C-CHANNEL REGISTER (to DSTo)
TIMING CONTROL REGISTER
LOOP-BACK REGISTER
RESERVED
RECEIVE GAIN CONTROL REGISTER
DSP CONTROL REGISTER
RESERVED
TRANSMIT AUDIO GAIN REGISTER
TRANSMIT DTMF GAIN REGISTER
RESERVED
TONE COEFFICIENT REGISTER 1
TONE COEFFICIENT REGISTER 2
RESERVED
TONE RINGER WARBLE RATE REGISTER
RESERVED
READ
RESERVED
VERIFY
VERIFY
RESERVED
RESERVED
VERIFY
VERIFY
RESERVED
NOT USED
VERIFY
VERIFY
C-CHANNEL REGISTER (from DSTi)
VERIFY
VERIFY
RESERVED
VERIFY
VERIFY
RESERVED
VERIFY
VERIFY
RESERVED
VERIFY
VERIFY
RESERVED
VERIFY
RESERVED
7-56
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