PIC Vietnam - giup em nhe

Code:
/////////////////////////////////////////////////////////////////////////

////                           EX_RTCLK.C                            ////

////                                                                 ////

////  This program reads and writes to an external Real Time Clock.  ////

////  It communicates to the user using the LCD and keypad.          ////

////                                                                 ////

////  Configure the CCS prototype card as follows:                   ////

////      Install the LCD and keypad.                                ////

////                                                                 ////

////  Jumpers:                                                       ////

////     PCB        pin A2 to RS232 RX, pin A3 to RS232 TX           ////

////     PCM,PCH    pin C7 to RS232 RX, pin C6 to RS232 TX           ////

////                                                                 ////

////  This example will work with the PCB, PCM and PCH compilers.    ////

////  The following conditional compilation lines are used to        ////

////  include a valid device for each compiler.  Change the device,  ////

////  clock and RS232 pins for your hardware if needed.              ////

/////////////////////////////////////////////////////////////////////////

////        (C) Copyright 1996,2003 Custom Computer Services         ////

//// This source code may only be used by licensed users of the CCS  ////

//// C compiler.  This source code may only be distributed to other  ////

//// licensed users of the CCS C compiler.  No other use,            ////

//// reproduction or distribution is permitted without written       ////

//// permission.  Derivative programs created using this software    ////

//// in object code form are not restricted in any way.              ////

/////////////////////////////////////////////////////////////////////////







//#elif defined(__PCM__)

#include <16F877.h>

#fuses HS,NOWDT,NOPROTECT,NOLVP

#use delay(clock=20000000)

#use rs232 (baud=9600, xmit=PIN_C6, rcv=PIN_C7)







#include <ds1302.c>

#include <lcd.c>

#include <kbd.c>



byte get_number() {

  char first,second;



  do {

    first=kbd_getc();

  } while ((first<'0') || (first>'9'));

  lcd_putc(first);

  first-='0';



  do {

    second=kbd_getc();

  } while ((second<'0') || (second>'9'));

  lcd_putc(second);

  second-='0';



  return((first*10)+second);

}



void set_clock(){

   byte day,mth,year,dow,hour,min;



   lcd_putc("\fYear 20: ");

   year=get_number();

   lcd_putc("\fMonth: ");

   mth=get_number();

   lcd_putc("\fDay: ");

   day=get_number();

   lcd_putc("\fWeekday 1-7: ");

   dow=get_number();

   lcd_putc("\fHour: ");

   hour=get_number();

   lcd_putc("\fMin: ");

   min=get_number();



   rtc_set_datetime(day,mth,year,dow,hour,min);

}



void main() {

   char cmd;

   byte day,mth,year,dow,hour,min,sec;



   rtc_init();

   lcd_init();

   kbd_init();



   lcd_putc("\f1: Change, 2: Display");



   do {

      cmd=kbd_getc();

   } while ((cmd!='1')&&(cmd!='2'));



   if(cmd=='1')

     set_clock();



   while (1) {

      lcd_putc('\f');

      rtc_get_date( day, mth, year, dow);

      rtc_get_time( hour, min, sec );

      printf(lcd_putc,"%2u/%2u/%2u\n%2u:%2u:%2u",mth,day,year,hour,min,sec);

      delay_ms(250);

   }

}
em không hiểu doạn này" printf(lcd_putc,"%2u/%2u/%2u\n%2u:%2u:%2u",mth,day,year,hour,min,sec);"ch� � "lcd_putc, " là the nào đấy ạ
cho em hỏi luôn muôn hoiển thi môt số thay đổi theo thời gian lên lcd thi câu lênh sẽ thế nào.ví dụ như hiển thị giờ , phút giây ấy
các cao thủ giúp em với nhé
thanks