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申请最小系板之前，还以为要像51那样配合ds1302才能显示实时时钟，不过看handbook了解到RL78G13自带实时时钟，这样电路就能大大简化。
操作RTC，首先要注意时钟的选择，子系统时钟要注意勾选XT1 oscillation




其次要记得关闭看门狗，不然时钟显示走动4秒又会退回去






接着是对时钟进行初始化操作

记得一开始我的时钟在液晶上一直显示全零，百思不得其解，后来发现是纯软件思维导致的，一开始仅仅定义了一个rtc_counter_value_t * counter_read_val指针变量，并没让它指向任何实体变量，后来改成下面这样问题得到解决
rtc_counter_value_t s;
 rtc_counter_value_t * counter_read_val=&s ;
关键代码：
void main(void)
{
    /* Start user code. Do not edit comment generated here */
     uchar temp;
 uchar p,*q;
     uchar time[7];
 rtc_counter_value_t s;
 rtc_counter_value_t * counter_read_val=&s ;
 uchar * week[]={"Sun","Mon","Tues","Wed","Thur","Fri","Sat"};
 
 
     PM1&=0x00;
 init_1602();
 R_RTC_Start();
 
    while (1U)
    {
 
  R_RTC_Get_CounterValue(counter_read_val);
 temp=counter_read_val->sec;
 temp=temp/16*10+temp%16;
 time[0]=temp;
        temp=counter_read_val->min;
 temp=temp/16*10+temp%16;
 time[1]=temp;
        temp=counter_read_val->hour;
 temp=temp/16*10+temp%16;
 time[2]=temp;
        temp=counter_read_val->week;
 temp=temp/16*10+temp%16;
 time[3]=temp;
        temp=counter_read_val->day;
 temp=temp/16*10+temp%16;
 time[4]=temp;
        temp=counter_read_val->month;
 temp=temp/16*10+temp%16;
 time[5]=temp;
        temp=counter_read_val->year;
 temp=temp/16*10+temp%16;
 time[6]=temp;
 
 //////////1602display//////////
 write_1602_com(0x80);
 write_1602_dat(2+'0');
 write_1602_dat(0+'0');
 write_1602_dat(time[6]/10+'0');
 write_1602_dat(time[6]%10+'0');
 write_1602_dat('-');
 write_1602_dat(time[5]/10+'0');
 write_1602_dat(time[5]%10+'0');
 write_1602_dat('-');
 write_1602_dat(time[4]/10+'0');
 write_1602_dat(time[4]%10+'0');
 write_1602_dat(' ');
 p=time[3]%10;//纯粹是为了消隐，若简单像时间那样赋值会出现这样的问题，比如由Thur过
 q=week[p];//渡到时Fri会不刷新最后一位导致显示Frir
 while(*week[p] != '\0')
 {
  write_1602_dat(*week[p]);
  week[p]++;
 }
 week[p]=q;
 write_1602_dat(' ');
 write_1602_com(0xc0);
 write_1602_dat(time[2]/10+'0');
 write_1602_dat(time[2]%10+'0');
 write_1602_dat(':');
 write_1602_dat(time[1]/10+'0');
 write_1602_dat(time[1]%10+'0');
 write_1602_dat(':');
 write_1602_dat(time[0]/10+'0');
 write_1602_dat(time[0]%10+'0');
 
   }

    /* End user code. Do not edit comment generated here */
}
图片展示：