Are SX register values lost after sleeping and wake-up?

william chan

Let's say we assign some values to a few registers in bank 7.
Then we make the SX go to sleep to save power.
When the SX wakes up, will the values in the registers be lost?

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JonnyMac

Couldn't you just write a simple test program to verify that? Or check the docs?...

Bean

william,

When the SX wakes up it starts executing code from the beginning again. It does NOT continue with the next command after the SLEEP command.

Read this application note: http://www.parallax.com/dl/appnt/sx/An18Reset.pdf

Also if you are using SX/B make sure you specify NOSTARTUP on the PROGRAM line or else the compiler WILL clear all variables after you wake-up from sleep.
Then you can just use:

· IF PD = 1 THEN ' Check "Power Down" flag
··· ' Power Up Code
· ELSE
··· ' Wake-up Code here
· ENDIF


Bean.

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Post Edited (Bean (Hitt Consulting)) : 10/6/2007 2:58:17 PM GMT

pjv

Hi William;

I agree with Jonny Mac, this is too easy to test by yourself.

However, now that I'm on-line, I will answer that the RAM memory remains unaffected on wake-from-sleep.

Cheers,

Peter (pjv)