GPS授时程序不能按秒显示需要隔一段时间才会更新秒，求解决(标签-ar|关键词-程序设计)

Question

设计制作实时时间显示、日期显示和位置显示，但是程序设计编译好后发现时间中的秒不能按秒刷新。其余的到没发现问题。请大家帮忙看下我的程序因为什么地方导致的不能按秒进行刷新。代码如下：
Uart_Init();

while(1)
{
    
    if(Flag_GPS_OK == 1 && RX_Buffer[4] == 'G' && RX_Buffer[6] == ',' && RX_Buffer[13] == '.')            //确定是否收到"GPGGA"这一帧数据
    {
        for( i = 0; i < 68 ; i++)
        {
            Display_GPGGA_Buffer[i] = RX_Buffer[i];    
        }
        Hour = (Display_GPGGA_Buffer[7]-0x30)*10+(Display_GPGGA_Buffer[8]-0x30)+8;            //UTC时间转换到北京时间UTC+8    
                                                                                            //0X30为ASCII码转换为数字
            if( Hour >= 24)                //溢出
        {
            Hour %= 24;                //获取当前Hour
            Flag_OV = 1;            //日期进位
        }
        else
        {
            Flag_OV = 0;
        }

        Min_High = Display_GPGGA_Buffer[9];
        Min_Low = Display_GPGGA_Buffer[10];

        Sec_High = Display_GPGGA_Buffer[11];
        Sec_Low = Display_GPGGA_Buffer[12];

        Flag_Calc_GPGGA_OK = 1;
        Delay_ms(5);
    }
      
        LCD12864_NoWaitIdle_COM_Write(0x80);            //设置指针
        LCD12864_write_word("★");                //显示内容
        LCD12864_Data_Write(Hour/10+0x30);
        LCD12864_Data_Write(Hour%10+0x30);
        LCD12864_write_word("时");

        LCD12864_Data_Write(Min_High);
        LCD12864_Data_Write(Min_Low);
        LCD12864_write_word("分");

        LCD12864_Data_Write(Sec_High);
        LCD12864_Data_Write(Sec_Low);
        LCD12864_write_word("秒");
        LCD12864_write_word("★");


        LCD12864_NoWaitIdle_COM_Write(0x98);            //设置指针
        LCD12864_write_word("纬度：");                //显示内容
        
        LCD12864_Data_Write(Display_GPGGA_Buffer[28]);            //N 或者 S
        LCD12864_Data_Write(' ');

        LCD12864_Data_Write(Display_GPGGA_Buffer[17]);            //纬度
        LCD12864_Data_Write(Display_GPGGA_Buffer[18]);            //纬度
        LCD12864_write_word("°");
        LCD12864_Data_Write(Display_GPGGA_Buffer[19]);            //纬度
        LCD12864_Data_Write(Display_GPGGA_Buffer[20]);            //纬度
        LCD12864_write_word("' ");


        LCD12864_NoWaitIdle_COM_Write(0x88);            //设置指针
        LCD12864_write_word("经度：");                //显示内容
        
        LCD12864_Data_Write(Display_GPGGA_Buffer[42]);            //E 或者 W

        LCD12864_Data_Write(Display_GPGGA_Buffer[30]);            //经度
        LCD12864_Data_Write(Display_GPGGA_Buffer[31]);    
        LCD12864_Data_Write(Display_GPGGA_Buffer[32]);    
        LCD12864_write_word("°");
      LCD12864_Data_Write(Display_GPGGA_Buffer[33]);            
        LCD12864_Data_Write(Display_GPGGA_Buffer[34]);        
        LCD12864_write_word("' ");


    if(Flag_GPS_OK == 1 && RX_Buffer[4] == 'M' && RX_Buffer[52] == ',' && RX_Buffer[59] == ',')            //确定是否收到"GPRMC"这一帧数据
    {
        for( i = 0; i < 68 ; i++)
        {
            Display_GPRMC_Buffer[i] = RX_Buffer[i];    
        }

        Year_High = Display_GPRMC_Buffer[57];
        Year_Low = Display_GPRMC_Buffer[58];

        Month_High = Display_GPRMC_Buffer[55];
        Month_Low = Display_GPRMC_Buffer[56];

        Day_High = Display_GPRMC_Buffer[53];
        Day_Low = Display_GPRMC_Buffer[54];


        if(Flag_OV == 1)            //有进位
        {
            UTCDate2LocalDate();            //UTC日期转换为北京时间        
        }

        Flag_Calc_GPRMC_OK = 1;
        Delay_ms(5);
    }

        
        LCD12864_NoWaitIdle_COM_Write(0x90);            //设置指针
        LCD12864_write_word("20");
        LCD12864_Data_Write(Year_High);
        LCD12864_Data_Write(Year_Low);
        LCD12864_write_word("年");

        LCD12864_Data_Write(Month_High);
        LCD12864_Data_Write(Month_Low);
        LCD12864_write_word("月");

        LCD12864_Data_Write(Day_High);
        LCD12864_Data_Write(Day_Low);
        LCD12864_write_word("日");
        
    }        
}

}