WDG Reset event flag

lmeyerovich · ‎2010-01-19

Posted on January 20, 2010 at 01:10

lmeyerovich · ‎2011-05-17

Posted on May 17, 2011 at 09:58

Hello,

I am working on STR91x processor

I am trying to use WDG_RST(WDG Reset event flag) in SCU_SYSSTATUS register.

While initializing PLL, after setting SCU_FLAG_LOCK

SCU->SYSSTATUS |=SCU_FLAG_LOCK

all other bits in SYSSTATUS register have been reset, so I am loosing WDG_RST information.

I have also tried to do the same thing manually in debugger and observed the same beviour.

Can anybody help?

Thank you

rudi2 · ‎2011-05-17

Posted on May 17, 2011 at 09:58

Hello,

do you perhaps have a solution for this. I am having the same problem that after a software watchdog reset, the SCU->SYSSTATUS did not set the WDG_RST flag accordingly.

Thank you!

roppen · ‎2011-05-17

Posted on May 17, 2011 at 09:58

That's because the SYSSTATUS register bits are cleared by writing a 1. You're or'ing in the current value of the SYSSTATUS register to itself, effectivly clearing each bit that's been set.

If you want to clear the SCU_FLAG_LOCK bit it you should be doing this-

SCU->SYSSTATUS = SCU_FLAG_LOCK;