Watch-Dog-Timer cause reboot

Eileen · 10-07-2005, 01:53 AM

Could anyone gives me any information related to watch-dog-timer that causes my product to reboot???

Any information will be helpfuly!!
Zillioms and thousands of thank you!!

Wim Sturkenboom · 10-07-2005, 04:30 AM

What product? And what do you want to know?
Specific hardware? Which CPU/microcontroller?

In general:
A watchdog-timer is a counter that counts to a certain value (sometimes a programmable value). When that value is reached, a reset signal is generated.
To prevent a reset, you have to 'kick' the watchdog-timer at a regular base. And here it depends on what kind of hardware you're talking about.
Microcontroller? Probably write to a register.
External watchdog? Probably toggle (or pulse) a pin on the wdt.

Eileen · 10-10-2005, 02:22 AM

Hello All,

Please dun ignore my "reboot" problem!
The error message is WDT_OVERFLOW.
I am using sh7709s, microprocessor.
But I am not the one designing the product.
Is there any ways to check on the wdtd portion??
What are the files related to wdtd??

Greatly Appreciate anyone who helps!!

Wim Sturkenboom · 10-10-2005, 06:09 AM

Sorry, not familiar with SH7709 and I don't seem to be able to easily find datasheets, application notes and programmer information.

Quote:

Originally posted by Eileen
But I am not the one designing the product.

So what are you doing? Programming it? Or using it?

Quote:

Originally posted by Eileen
The error message is WDT_OVERFLOW.

When do you get that message? Compile time, while running in debugger, runtime ?
Sounds to me like a warning from a (hardware) debugger.

Quote:

Originally posted by Eileen
Is there any ways to check on the wdtd portion??

Debugger.

Quote:

Originally posted by Eileen
What are the files related to wdtd??

How do you mean? Documentation files? Source files? Ask the programmer who's writing the code.