SD2405AL_REG_T_YEAR
time->tm_year = bcd2bin(data[SD2405AL_REG_T_YEAR]) + 100;
data[SD2405AL_REG_T_YEAR] = bin2bcd(time->tm_year - 100);
#define SD2405AL_NUM_T_REGS (SD2405AL_REG_T_YEAR - SD2405AL_REG_T_SEC + 1)