缘由小容量的单片机芯片怎么提高存储空间利用率? - 24小时必答区 https://bbs.csdn.net/topics/600865890

#include "reg52.h"
sbit k=P2^0;
void main()
{unsigned char a=0,xd=0;while(1){if(k==0&&++xd==0){++a;while(k==0);}if(a==1)P0=~1;else if(a==2)P0=~3;else if(a==3)P0=~2;else {P0=255;a=0;}}
}

#include "reg52.h"
sbit k=P2^0;
unsigned char led[]={0,1,3,2};
void main()
{unsigned char a=0,xd=0;while(1){if(k==0&&++xd==0){++a;while(k==0);}if(a>=4)a=0;P0=~led[a];}
}

#include "reg52.h"
sbit k=P2^0;
unsigned char led[]={0,1,3,2};
void main()
{unsigned char a=0,xd=0;while(1){if(k==0&&++xd==0){++a;while(k==0);}if(a==4)a=0;P0=~led[a];}
}

#include "reg52.h"
sbit k=P2^0;
void main()
{unsigned char a=0,xd=0;while(1){if(k==0&&++xd==0){++a;while(k==0);}switch(a){case 0x01:	P3 = 1;	break;case 0x02:	P3 = 3;	break;case 0x03:	P3 = 2;	break;default:	P3 = 0; a = 0;	break;}}
}

C:0x0000    020032   LJMP     C:0032main:
C:0x0003    E4       CLR      A
C:0x0004    FF       MOV      R7,A
C:0x0005    FE       MOV      R6,A
C:0x0006    20A008   JB       k(0xA0.0),C:0011
C:0x0009    0E       INC      R6
C:0x000A    EE       MOV      A,R6
C:0x000B    7004     JNZ      C:0011
C:0x000D    0F       INC      R7
C:0x000E    30A0FD   JNB      k(0xA0.0),C:000E
C:0x0011    EF       MOV      A,R7
C:0x0012    24FE     ADD      A,#0xFE
C:0x0014    600C     JZ       C:0022
C:0x0016    14       DEC      A
C:0x0017    600E     JZ       C:0027
C:0x0019    2402     ADD      A,#0x02
C:0x001B    700F     JNZ      C:002C
C:0x001D    75B001   MOV      P3(0xB0),#0x01
C:0x0020    80E4     SJMP     C:0006
C:0x0022    75B003   MOV      P3(0xB0),#0x03
C:0x0025    80DF     SJMP     C:0006
C:0x0027    75B002   MOV      P3(0xB0),#0x02
C:0x002A    80DA     SJMP     C:0006
C:0x002C    E4       CLR      A
C:0x002D    F5B0     MOV      P3(0xB0),A
C:0x002F    FF       MOV      R7,A
C:0x0030    80D4     SJMP     C:0006
C:0x0032    787F     MOV      R0,#0x7F
C:0x0034    E4       CLR      A
C:0x0035    F6       MOV      @R0,A
C:0x0036    D8FD     DJNZ     R0,C:0035
C:0x0038    758107   MOV      SP(0x81),#0x07
C:0x003B    020003   LJMP     main(C:0003)

Program Size: data=9.0 xdata=0 code=71
Program Size: data=13.0 xdata=0 code=186
Program Size: data=13.0 xdata=0 code=180
Program Size: data=9.0 xdata=0 code=62