External Battery Assembling; Watchdog - DIGITAL-LOGIC MICROSPACE MSM800SEV Technical User's Manual

DIGITAL-LOGIC AG
4.7.2

External battery assembling:

If customer wants to connect an external battery (check for the appropriate connector in the chapter
DESCRIPTION OF THE CONNECTORS), then some precautions have to be made:
•
The battery is protected from charging. Do not use a charchable battery
•
The RTC device (SuperIO) defines a voltage level of 2.0V...3.6V, so do use an external battery, which
will be in this range (inclusive the diode which is already assembled onboard)
4.8

Watchdog

The watchdog timer detects a system crash and performs a hardware reset. After power up, the watchdog is
always disabled as the BIOS does not send strobes to the watchdog. In case that the user wants to take ad-
vantage of the watchdog, the application must produce a strobe at least every 800 ms. If no strobe occures
within the 800 ms, the watchdog resets the system.
Please refer to the chapter 11.
There are also some programming examples available:
Product CD-Rom or customer download area: \tools\SM855\int15dl\...
The watchdog feature is integrated in the INT15 function.
28
MSM800 SEV Manual V1.0A