PSF21150 INFINEON [Infineon Technologies AG], PSF21150 Datasheet - Page 226

• Manufacturer Part Number: PSF21150
• Description: IPAC-X ISDN PC ADAPTER CIRCUIT
• Manufacturer: INFINEON [Infineon Technologies AG]

For general information please refer to
RSS2, RSS1... Reset Source Selection 2,1
The IPAC-X reset sources for the RSTO output pin can be selected according to the
table below.
• If RSS = ’00’ no above listed reset source is selected and therefore no reset is
• Watchdog Timer
• If RSS = ’10’ is selected the following two reset sources generate a reset pulse of
After a reset pulse generated by the IPAC-X and the corresponding interrupt (WOV or
CIC) the actual reset source can be read from the ISTA.
Data Sheet
Bit 1
generated at RSTO.
After the selection of the watchdog timer (RSS = ’11’) the timer is reset and started.
During every time period of 128 ms the microcontroller has to program the WTC1 and
WTC2 bits in two consecutive bit pattern (see description of the WTC1, 2 bits)
otherwise the watchdog timer expires and a reset pulse of 125 µs
generated. Deactivation of the watchdog timer is only possible with a hardware reset.
125 µs
- External (Subscriber) Awake (EAW)
The EAW input pin serves as a request signal from the subscriber to initiate the awake
function in a terminal and generates a reset pulse (in TE mode only).
- Exchange Awake (C/I Code)
A C/I Code change generates a reset pulse.
0
0
1
1
RSS
Bit 0
0
1
0
1
t  250µs at the RSTO pin:
C/I Code
Change
--
--
x
(reserved)
EAW
--
--
x
Chapter
226
Watchdog
Timer
3.3.9.
--
--
x
Detailed Register Description
PSB 21150
PSF 21150
t 250 µs is
2000-07-21