SECONDS_REG
I2C_WRITE(sc, SECONDS_REG, bintobcd(dt->dt_sec));
dt->dt_sec = bcdtobin(I2C_READ(sc, SECONDS_REG));
seconds_reg = POWER_READ(sc, SECONDS_REG);
POWER_WRITE(sc, SECONDS_REG, bintobcd(dt->dt_sec));