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U4091BM-R Arkusz danych(PDF) 15 Page - ATMEL Corporation

Numer części U4091BM-R
Szczegółowy opis  Programmable Telephone Audio Processor
PDF  38 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U4091BM-R Arkusz danych(HTML) 15 Page - ATMEL Corporation

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15
4872A–CORD–08/05
U4091BM-R
10.1
Power-on Reset
To avoid undefined states of the system when it is powered on, an internal reset clears the inter-
nal registers.
The system (U4091BM-R + microcontroller) is woken up by any of the following conditions:
• VMP > 2.75V and VB > 2.95V
• 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-volt-
age reset, or by the watchdog function (see Figure 12-2 on page 17, Figure 12-3 on page 17 and
Figure 12-4 on page 17).
11. Watchdog Function
To avoid the system operating the microcontroller in a fault state, the circuit provides a watchdog
function. The watchdog has to be retriggered every second by triggering the serial bus (sending
information to the IC or other remote components at the serial bus). If there has been no bus
transmission for more than one second, the watchdog initiates a reset.
The watchdog provides a reset for the external microcontroller, but does not change the
U4091BM-R’s registers.
R14
TM
CLOR
R14B0
TME2
Test mode enable (high active)
0
R14B1
TME3
Test mode enable (low active)
0
R14B2
Reserved
-
0
R14B3
CLOR0
Adjustment for calculated receive log amp LSB
0
R14B4
CLOR1
Adjustment for calculated receive log amp
0
R14B5
CLOR2
Adjustment for calculated receive log amp
0
R14B6
CLOR3
Adjustment for calculated receive log amp
0
R14B7
CLOR4
Adjustment for calculated receive log amp MSB
0
R15
CLOT
R15B0
Reserved
-
0
R15B1
Reserved
-
0
R15B2
Reserved
-
0
R15B3
CLOT0
Adjustment for calculated transmit log amp LSB
0
R15B4
CLOT1
Adjustment for calculated transmit log amp
0
R15B5
CLOT2
Adjustment for calculated transmit log amp
0
R15B6
CLOT3
Adjustment for calculated transmit log amp
0
R15B7
CLOT4
Adjustment for calculated transmit log amp MSB
0
Table 10-6.
Names and Functions of the Serial Registers (Continued)
Register
Group
No.
Name
Description
Status



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