ATmega128 - zliczanie impulsow!

Witam! Na ilu kanalach w ATmega128 moge zliczac impulsy z wentylatora? Potrzebuje z 5-6 kanalow. Czy mozna to zrobic na jakims multiplexerze? Sterownik wentylatora zwiera 12 V do masy (2x na obrot). Czy jak polacze wyjscie went. do masy przez rezystor i do uKto wystarczy ?

R Wy.Went---/\/\/\/\---+----- GND | | uK

Serdecznie pozdrawiam Michal

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