unsigned long old_utcr3 = _regs->read<unsigned int>(UTCR3);
_regs->write<unsigned int>(UTCR3, old_utcr3 & ~(UTCR3_RIE|UTCR3_TIE));
unsigned long old_utcr3 = _regs->read<unsigned int>(UTCR3);
_regs->write<unsigned int>(UTCR3, old_utcr3 & ~(UTCR3_RIE|UTCR3_TIE));