S08, how to disable pins to decrease power comsuption?

[w_tension]

The DOCs suggest "Configure port pins to minimize current drain", But didn't mention HOW-TO.

[kef2 · Accepted solution]

Current drain rises when digital input floats between '0' and '1' levels. To eliminate it do one of the following on all your unused digital inputs:

1) turn input to output using data direction registers

2) enable pull device, both pull-up and pull-down are OK.

3) pull inputs externally to I/O supply rails, usually vss or vdd

Since lower pin count packages may have non bonded out pin pads, you should not forget to turn them into outputs as well.

Edward

[w_tension]

Thanks, I'm using MC9S08QG4 TSSOP-16.

As I see in its datasheet, Max pin number is 24, So I should take them in count too.

[vicentegomez]

Hi

Also remember disable all the modules that you are not using

I do not know the family that you are using but please check the following application note

AN4441​

[w_tension]

Thanks, I've read the document.