Class _psb: clock prescaler

A class _psb object is a resettable clock prescaler that can be connected to one of 3 possible clocks:

• ioclk;
• pll_32MHz;
• pll_64MHz;

It is used in:

• ATtiny25/45/85 : prescaler1

Actions

configure:

hwa( configure, prescaler0,
 
     clock,   ioclk
            | pll_32MHz
            | pll_64MHz );

Note 1 pll_32MHz is not available when the PLL is used as system clock (HW_DEVICE_CLK_SRC is "`rc_pll_16MHz`").

Note 2 pll_64MHz is not available when supply voltage is below 2.7 V (HW_DEVICE_BODLEVEL is "`1700_2000mV`").

Note 3 It is highly recommended that the counter is stopped whenever the prescaler clock is switched between "`pll_32MHz`" and "`pll_64MHz`".

Note 4 Turning the PLL on requires a special procedure that taked about 100 µs to execute.

Note 5 The PLL is never stopped once it has been turned on.

Reset

The reset action resets the prescaler immediately without stopping it:

hw( reset, prescaler0 );