CC1110 watch dog not reset when in PM2 sleep mode

Jason Xiao1

Hi,

I am new in CC1110 chip, got problem when enable watchdog.

To enable watchdog, I set WDCTL to 0x08. And periodically program WDCTL to 0xa8 and 0x58 in the main loop. But when invoke sleep routine, which CC1110 will enter into PM2 sleep mode. I see chip is reset after 1 second.

From datasheet it says watchdog is reset in PM2/PM3 mode. And my sleep routine follows DN106 sample code. Any suggestion?

Thanks,

Jason

over 10 years ago

0 Vihang Parmar over 10 years ago

TI__Mastermind 29301 points

Hi Jason,

Have you looked at Section 1 in this errata note? http://www.ti.com/lit/er/swrz022c/swrz022c.pdf

Also, have you made sure the device enters the PM2 mode every 1 second after the watchdog timer times out?

Best Regards,

Vihang

0 Jason Xiao1 over 10 years ago in reply to Vihang Parmar

Prodigy 70 points

Yes, thanks for help. I do read this document. And now I have solved the problem. There is while loop in workaround before enter into sleep, i.e.

char temp = WORTIME0;

while( temp == WORTIME0);

If I turn on watch dog, it will trig reset. So I just modify the workaround a little,

char temp = WORTIME0;

while( temp == WORTIME0){

//reset watch dog counter

WDCTL = 0xa0;

WDCTL = 0x50;

}

Thanks,

Jason

Sub-1 GHz

Sub-1 GHz forum

CC1110 watch dog not reset when in PM2 sleep mode