PCF8563_R_SECOND
uint8_t reg = PCF8563_R_SECOND;
if (bcd[PCF8563_R_SECOND] & PCF8563_M_VL)
dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND);
uint8_t reg = PCF8563_R_SECOND;
bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec);