ELCR_WRITE
ELCR_WRITE(ELCR0, icu_elcr & 0xff);
ELCR_WRITE(ELCR1, (icu_elcr >> 8) & 0xff);
ELCR_WRITE(ELCR0, icu_elcr);
ELCR_WRITE(ELCR1, icu_elcr >> 8);