USART in power down mode

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What is the usage of USART start frame detector in power down mode...

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Quote:

What is the usage of USART start frame detector in power down mode...

Ummm--to detect the start of frame?

Seriously--give a bit more information. What AVR model are you working with? IIRC there are only a few AVR models that have start-frame detector.

Then, what does the datasheet say about its use? The first think I would do to answer would be to find the information in the datasheet and parrot it here.

Quote:
16.9.4 Start Frame Detection
The USART start frame detector can wake up the MCU from Power-down, Standby or ADC Noise Reduction sleep
mode when it detects a start bit. ...

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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Solved!

 

ldi r16, (1 << SE)|(1 << SM1) // Power Down
out SMCR, r16
sleep

 

But need turn off fuse-bit OCDEN