SDHC_HOST_CTL2
HCLR2(hp, SDHC_HOST_CTL2, SDHC_UHS_MODE_SELECT_MASK);
HSET2(hp, SDHC_HOST_CTL2, SDHC_UHS_MODE_SELECT_DDR50);
HSET2(hp, SDHC_HOST_CTL2, SDHC_1_8V_SIGNAL_EN);
HCLR2(hp, SDHC_HOST_CTL2, SDHC_1_8V_SIGNAL_EN);
!ISSET(HREAD2(hp, SDHC_HOST_CTL2), SDHC_1_8V_SIGNAL_EN))