An independent timer module usually incorporated into the same chip as a uProcessor which resets the processor after a certain length of time. The idea is that during usual operation the code running should always be able to reset the watchdog timer before the watchdog resets the processor. If the ...
2
votes
2answers
114 views
Arduino w/ Atmega328: can't clear the watchdog
I'm using the onboard software watchdog facility of an Atmega328 like documented here.
My purpose is to limit to 2 seconds the execution of a portion of code that could lead to endless computation.
...
2
votes
1answer
58 views
Fail to verify if watch dog timer works properly
I wrote a simple watch dog timer program. First I light up a LED, and I want to see if watch dog timer will reset the chip and the LED would be turned off(I didn't feed the watch dog).
...
1
vote
1answer
230 views
How to use watchdog timer in ATmega128
I am working with an ATmega128 and need to reset the microcontroller after some 10 seconds has passed and the user has not interacted with microcontroller. As an example when the user has not pressed ...
2
votes
2answers
162 views
Low power, cheap, long timeout, watchdog circuit
I need a circuit to act as a watchdog to a micro (which is not powered (instead of in a sleep mode)most of the time).
it needs to be low power (< ~4uA) and non-programmable. So no I2C RTCs or ...
0
votes
2answers
167 views
PIC: Watchdog timer off by a factor of 4
I have a PIC16 (datasheet here) for which I use the watchdog timer. I configure the watchdog timer as follows:
WDTCONbits.WDTPS = 0b01110;
According to page 105 ...
4
votes
2answers
278 views
How to debug reset caused by WDTCTL security key violation in MSP430F1611?
I'm working on a sensor project which uses TelosB based on MSP430F1611 running TinyOS. My program is reset some time after boot up. After the PUC reset, IFG1 is found with WDTIFG bit set, indicating ...
3
votes
3answers
132 views
Effective use of output signal of a watchdog timer
Subsequent to my previous question regarding watchdog timers, I am interested in deciding the RESULT of such a watchdog:
Assume I add a generic external watchdog timer to my circuit. If not toggled ...
5
votes
3answers
440 views
Which of these approaches for a watchdog timer?
I recently learned about watchdog timers, and am trying to implement one for my circuit for the purpose of resetting my (AVR) microcontroller if it hangs (i.e., doesn't respond to the watchdog).
...
1
vote
2answers
87 views
Watchdog Signature in Flash memory or RAM?
We used to use Watchdog signatures in our control applications.
Basically we used to allocate a reserved memory in RAM(uninitialized) and used to store the watchdog signatures.
On power on, the ...
2
votes
2answers
426 views
74123 vs 4538 as watchdog timer
I want to use a retriggerable monostable multivibrator as a hardware watchdog. This is for an amateur satellite project so I need to use basic rad hard logic chips (as opposed to more sophisticated ...
2
votes
2answers
761 views
Watchdog reset using C32 v2.00 compiler
Compiling an existing PIC32 project using the v2.00 C compiler produces a continual watchdog reset. This problem does not appear using the previous v1.12 compiler. Changing the watchdog postscaler ...
4
votes
2answers
272 views
Microcontroller's watchdog
Can anyone explain a little more about watchdogs, specifically in the circuitry level?
If there is some kind of problem in the chip, how can I guarantee that it will be kept running? It is ...
3
votes
3answers
2k views
ARM watchdog reset
I have an MP3 development board I picked up from sparkfun that runs off the LPC2148 ARM processor. In looking through the code, I see a function to force a watchdog reset. My question is, how do you ...
