Posted on May 17, 2011 at 13:43Hej Thomas,
Few smaller things:
The JTCK line has a weak internal pull down, so consider changing your external pull up to a pull down if you are concerned about your current consumption in stop mode.
I've also seen it recommended to have 100n bypass on the reset line. This signal is quite ''hot'' so it can be triggered with a multimeter.
Be careful with the 32 kHz xtals load capacitance. 12p will not work reliably. Use a 6p xtal. With short lines and few pF in your layout your capacitors are down at 6-7pF but 10p might also work fine.
If you add a testpoint on the tamper pin, you can later check the frequency accuracy and adjust it if necessary.
You are not using the VREFs ?
I would connect them to 33 and 30 and maybe add a small resistor in series with L1 to filter the noise.
Good Luck, and let us know how it worked.
Bo
