5.3.1
#include<reg52.h>
#include<stdio.h>
extern serial_initial();
unsigned char x_at_0x30;
unsigned char y_at_0x31;
main()
{
serial_initial();
x=0x58;
y=0x9b;
x=((x&0XF0)>>4)|((y&0X0F)<<4);
printf("x=%#bX\n",x);
while(1);
}
-------------------------------------------------
5.3.2
#include<reg52.h>
#include<stdio.h>
extern serial_initial();
sbit T=P1^0;
sbit U=P1^1;
sbit V=P1^2;
sbit W=P1^3;
sbit X=P1^4;
sbit Y=P1^5;
sbit Z=P1^6;
unsigned char bdata F_at_0x24;
sbit Q=F^0;
main()
{
serial_initial();
P1=0xff;
Q=(U&&(!(V||W)))||(X&&Y)||Z||(!T);
printf("x=%#bX\n",(char)F);
while(1);
}
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