Class _psa: clock prescaler

A class _psa object is a resettable clock prescaler connected to the I/O clock.

It is used in:

• ATtiny24/44/84 : prescaler0
• ATtiny25/45/85 : prescaler0
• ATmega48A/PA/88A/PA/168A/PA/328/P : prescaler0, prescaler1

Actions

reset:

The reset action resets the prescaler immediately without stopping it:

hw( reset, prescaler0 );

---

hw( clear, ... ) resets the prescaler immediately without stopping it:

hw( clear, prescaler0 );

Stop

The turn action can reset and stop the prescaler:

hw( turn, prescaler0, off ); //  Reset and halt the prescaler

or release it:

hw( turn, prescaler0, on );  //  Release the prescaler

Configuration

_psa class prescalers are all clocked by the I/O clock.

hwa( configure, prescaler0,
     clock,     ioclk       );