First Feed dog error make a reset

[liujinhang]

hi,

we met a problem when we operation the 33907. the problem is the 5744 will not be reset by 33907 when the first feed dog command is error in 256ms initial time window.

in order to be easy to analyze the problem, i made a smallest project to reproduction the fault phenomenon. see the attachment.

Original Attachment has been moved to: MPC5744P_MC33907_8_Demo.zip

[liujinhang]

anybody help us?

[TomasVaverka]

Hi Liu,

I suspect that the MC33907 is in the Debug mode. This is why RSTB is not asserted by wrong WD refresh during the INIT phase.

Best regards,

Tomas

[liujinhang]

Hi tomas ,

have you test the error project?  

if you also find the error as we described, we want to know the reason.

if you cann't find the error, we will find if our project  wrong.

we need to close this problem , please help us. 

[liujinhang]

hi Tomas,

can you please test the error program just once, to check if we have the problem actually?

thank you very much.

[chshli]

Hi Tomas,

I'm sure the 33907 is not in the Debug mode.And if the watchdog is not refreshed during this 256 ms open window (INIT FS phase), the device asserts the reset low.