PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 226

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

4.2.14
4.2.15
Value after reset:
WTC1, 2 Watchdog Timer Control 1, 2
TEM
PFS
Semiconductor Group
7
Contains the value received in the B2 channel, as programmed
(see C2C1, C2C0, SPCR register).
7
After the watchdog timer mode has been selected (STCR:TSF = CIXR:RSS = 1) the
watchdog timer is started.
During every time period of 128 ms the processor has to program the WTC1- and
WTC2-bit in the following sequence:
to reset and restart the watchdog timer.
If not, the timer expires and a WOV interrupt (EXIR) together with a reset pulse is ge-
nerated.
Test Mode
In Test mode (TEM = 1, PFS = 0) all layer-1 functions are disabled and the ISAC-S
behaves like an ICC (PEB 2070) device.
Prefilter Select
These bits together determine the pre-filter delay compensation and the test mode
(layer 1 disabled) of the ISAC-S, as follows:
B2 Channel Register
Additional Feature Register 1
WTC1
TEM
0
0
1
1
WTC2
00
H
1.
2.
PFS
0
1
1
0
TEM
PFS
WTC1
1
0
Effect
No pre-filter (0 delay)
Pre-filter delay compensation 520 ns
Pre-filter delay compensation 910 ns
Test mode (layer 1 disabled)
226
CFS
B2CR
ADF1
WTC2
0
1
FC2
Write
Read
FC1
Register Description
ITF
Address 38
Address 38
0
0
H
H