求助！！！这个题怎么做啊，来个大佬帮帮忙！非常感谢！！
向单片机内存单元0x30写入45的BCD码，45的BCD码的十位存入0x40单元，个位存入0x41单元
//#include "REG51.H"
#include "STC15F2K60S2.H"
void main( )
{ unsigned char x,yh,yl,*p; x =0x26; yl =x&0x0f; yh =(x>>4)&0x0f; p =0x41; *p =yl; p =p-1; *p =yh; while(1) { ; }

}