Maskování bitů

#define ZapBit(registr,pin) ((registr)|=1<<(pin))
#define VypBit(registr,pin) ((registr)&=~(1<<(pin)))
#define InvertBit(registr,pin) (registr^=1<<pin)
#define GetBit(registr,pin) ((registr)&(1<<(pin)))


debug &= 0xC;
debug = ~debug;
debug &= 0xC;
pokus ^= ~pokus;
//pokus |= debug;