8-bit MicrocontrollersのトピックRe: Best Way to Create Power Up Pulse Generator to Wake Up MCU

Best Way to Create Power Up Pulse Generator to Wake Up MCU

Byar — Tue, 03 Apr 2007 03:44:02 GMT

I was wondering what some of the common ways is to create a power up pulse to wake up a MCU in stop mode? Most of the voltage supervisor and monitors assert a reset anytime the VCC/monitor voltage of the supervisor falls. This has the effect of waking the MCU up but not letting the program run which increases the current draw from a battery backup.

Thanks,
Lucas

Re: Best Way to Create Power Up Pulse Generator to Wake Up MCU

bigmac — Tue, 03 Apr 2007 09:53:51 GMT

Hello Lucas,

Have a look at the operation of the KBI module in the datasheet for the MCU type you are using. See if this will meet your requirements.

Regards,

Mac

Re: Best Way to Create Power Up Pulse Generator to Wake Up MCU

Wings — Tue, 03 Apr 2007 18:15:05 GMT

It sounds to me like you're looking for some external very low power hardware to generate a wake-up signal. A while back I used a DS2417 timekeeper chip for this. It draws almost zero power and as an added benefit gives you an accurate time base. You get a wakeup signal every second, crystal controlled.