Ok ich verstehe.
Was wird denn in der Ticker Service Interrupt Routine erledigt?

Ticker_isr:
$asm
push R25
push R24
IN R24, SREG
PUSH R24
$end Asm

Ticker_timer = Ticker_preload ' reset the timer register with calculated preload value
Ticker_newtick = True ' set flag
$asm
pop R24
Out Sreg , R24
POP R24
pop R25
$end Asm
Return