#include <reg51.h>
void main(void)
  {
    unsigned char x, y, z;
    unsigned char mybyte = 0x29;
    x = mybyte & 0x0F;      	
    P1 =  x | 0x30;         	
    y = mybyte & 0xF0;       	
    y = y >> 4;            	
    P2 = y | 0x30;         	
  }