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I have had mechanical P-B and lever switches bounce as high as 300 mS (really crappy

switch), but always did debounce in code/hw.

The HW approach an ARM series with many different analog and digital resources on chip,

multiple copies of each in most cases, see below. Its basically a system OnChip.

The debounce components in it just drag and drop...in this series of parts a "component" is on onchip

resource.

[ATTACH=full]198548[/ATTACH]

System on chip looks like -

[ATTACH=full]198549[/ATTACH]