Go Down

Topic: watchdog reset hardware behavior (Read 1 time) previous topic - next topic

bigfun

After much experimenting, I was finally able to implement the Atmega328's watchdog.  This required, among other things, use of the Optiboot bootloader (which works so much better than stock bootloaders!).  My question is:  does anyone know if a reset generated by the watchdog timer actually pulls the Atmega328's reset line low electrically?  I'm curious because that line is connect to other things and it would be nice to know that they are also rebooting (or, if they are not, i might need to do something).  I know I could watch the reset line with an oscilloscope, but I don't feel like taking the circuit out of its application and hooking all that up right now.

retrolefty

Quote
My question is:  does anyone know if a reset generated by the watchdog timer actually pulls the Atmega328's reset line low electrically?


No it does not. Figure 8.1 of the Atmel datasheet for the 328 shows that the WDT reset is applied internally and does not wire to the reset pin.


Lefty

Go Up