U4091BM-R Datasheet, PDF (15/38 Pages) ATMEL Corporation – Programmable Telephone Audio Processor

U4091BM-R
Table 10-6.
Register
R14
R15
Names and Functions of the Serial Registers (Continued)
Group
No.
Name
Description
R14B0
TME2
Test mode enable (high active)
R14B1
TME3
Test mode enable (low active)
R14B2
Reserved
-
TM
CLOR
R14B3
R14B4
CLOR0
CLOR1
Adjustment for calculated receive log amp LSB
Adjustment for calculated receive log amp
R14B5
CLOR2
Adjustment for calculated receive log amp
R14B6
CLOR3
Adjustment for calculated receive log amp
R14B7
CLOR4
Adjustment for calculated receive log amp MSB
R15B0
Reserved
-
R15B1
Reserved
-
R15B2
Reserved
-
CLOT
R15B3
R15B4
CLOT0
CLOT1
Adjustment for calculated transmit log amp LSB
Adjustment for calculated transmit log amp
R15B5
CLOT2
Adjustment for calculated transmit log amp
R15B6
CLOT3
Adjustment for calculated transmit log amp
R15B7
CLOT4
Adjustment for calculated transmit log amp MSB
Status
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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.
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4872A–CORD–08/05