REGC_PERIODIC
events = wait_for_flag(REGC_UPDATE | REGC_PERIODIC);
if ((events & REGC_PERIODIC) != 0) {
events = wait_for_flag(REGC_UPDATE | REGC_PERIODIC);
if ((events & REGC_PERIODIC) != 0) {
if ((events & REGC_PERIODIC) != 0) {