INTRL_ENA
#define INTRL_REG_TO_USEC(intrl) ((intrl & ~INTRL_ENA) << 2)
return ((intrl >> 2) | INTRL_ENA);
#define INTRL_REG_TO_USEC(intrl) ((intrl & ~INTRL_ENA) << 2)
#define INTRL_USEC_TO_REG(set) ((set) ? ((set) >> 2) | INTRL_ENA : 0)