直接用写flash就行，stcisp上有例程。

1. /*------------------------------------------------------------------*/
   
2. /* --- STC MCU Limited ---------------------------------------------*/
   
3. /* --- STC89-90xx Series MCU ISP/IAP/EEPROM Demo -------------------*/
   
4. /* If you want to use the program or the program referenced in the  */
   
5. /* article, please specify in which data and procedures from STC    */
   
6. /*------------------------------------------------------------------*/
   
7. 
   
8. #include "reg51.h"
   
9. #include "intrins.h"
   
10. 
    
11. typedef unsigned char BYTE;
    
12. typedef unsigned int WORD;
    
13. 
    
14. /*Declare SFR associated with the IAP */
    
15. sfr IAP_DATA    =   0xE2;           //Flash data register
    
16. sfr IAP_ADDRH   =   0xE3;           //Flash address HIGH
    
17. sfr IAP_ADDRL   =   0xE4;           //Flash address LOW
    
18. sfr IAP_CMD     =   0xE5;           //Flash command register
    
19. sfr IAP_TRIG    =   0xE6;           //Flash command trigger
    
20. sfr IAP_CONTR   =   0xE7;           //Flash control register
    
21. 
    
22. /*Define ISP/IAP/EEPROM command*/
    
23. #define CMD_IDLE    0               //Stand-By
    
24. #define CMD_READ    1               //Byte-Read
    
25. #define CMD_PROGRAM 2               //Byte-Program
    
26. #define CMD_ERASE   3               //Sector-Erase
    
27. 
    
28. /*Define ISP/IAP/EEPROM operation const for IAP_CONTR*/
    
29. //#define ENABLE_IAP 0x80           //if SYSCLK<40MHz
    
30. #define ENABLE_IAP   0x81           //if SYSCLK<20MHz
    
31. //#define ENABLE_IAP x82            //if SYSCLK<10MHz
    
32. //#define ENABLE_IAP 0x83           //if SYSCLK<5MHz
    
33. 
    
34. //Start address for STC89C58xx EEPROM
    
35. #define IAP_ADDRESS 0x08000
    
36. 
    
37. void Delay(BYTE n);
    
38. void IapIdle();
    
39. BYTE IapReadByte(WORD addr);
    
40. void IapProgramByte(WORD addr, BYTE dat);
    
41. void IapEraseSector(WORD addr);
    
42. 
    
43. BYTE count1_Old;
    
44. 
    
45. void main()
    
46. {
    
47.         count1 = IapReadByte(0x2000);
    
48.         count1_Old = count1;
    
49.     while (1)
    
50.         {
    
51.                 if(count1_Old != count1)
    
52.                 {
    
53.                         IapEraseSector(0x2000);
    
54.                         IapProgramByte(0x2000, count1);
    
55.                         count1_Old = count1;
    
56.                 }
    
57.                 //你的代码
    
58.                
    
59.         };
    
60. }
    
61. 
    
62. /*----------------------------
    
63. Software delay function
    
64. ----------------------------*/
    
65. void Delay(BYTE n)
    
66. {
    
67.     WORD x;
    
68. 
    
69.     while (n--)
    
70.     {
    
71.         x = 0;
    
72.         while (++x);
    
73.     }
    
74. }
    
75. 
    
76. /*----------------------------
    
77. Disable ISP/IAP/EEPROM function
    
78. Make MCU in a safe state
    
79. ----------------------------*/
    
80. void IapIdle()
    
81. {
    
82.     IAP_CONTR = 0;                  //Close IAP function
    
83.     IAP_CMD = 0;                    //Clear command to standby
    
84.     IAP_TRIG = 0;                   //Clear trigger register
    
85.     IAP_ADDRH = 0x80;               //Data ptr point to non-EEPROM area
    
86.     IAP_ADDRL = 0;                  //Clear IAP address to prevent misuse
    
87. }
    
88. 
    
89. /*----------------------------
    
90. Read one byte from ISP/IAP/EEPROM area
    
91. Input: addr (ISP/IAP/EEPROM address)
    
92. Output:Flash data
    
93. ----------------------------*/
    
94. BYTE IapReadByte(WORD addr)
    
95. {
    
96.     BYTE dat;                       //Data buffer
    
97. 
    
98.     IAP_CONTR = ENABLE_IAP;         //Open IAP function, and set wait time
    
99.     IAP_CMD = CMD_READ;             //Set ISP/IAP/EEPROM READ command
    
100.     IAP_ADDRL = addr;               //Set ISP/IAP/EEPROM address low
     
101.     IAP_ADDRH = addr >> 8;          //Set ISP/IAP/EEPROM address high
     
102.     IAP_TRIG = 0x46;                //Send trigger command1 (0x46)
     
103.     IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
     
104.     _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
     
105.     dat = IAP_DATA;                 //Read ISP/IAP/EEPROM data
     
106.     IapIdle();                      //Close ISP/IAP/EEPROM function
     
107. 
     
108.     return dat;                     //Return Flash data
     
109. }
     
110. 
     
111. /*----------------------------
     
112. Program one byte to ISP/IAP/EEPROM area
     
113. Input: addr (ISP/IAP/EEPROM address)
     
114.        dat (ISP/IAP/EEPROM data)
     
115. Output:-
     
116. ----------------------------*/
     
117. void IapProgramByte(WORD addr, BYTE dat)
     
118. {
     
119.     IAP_CONTR = ENABLE_IAP;         //Open IAP function, and set wait time
     
120.     IAP_CMD = CMD_PROGRAM;          //Set ISP/IAP/EEPROM PROGRAM command
     
121.     IAP_ADDRL = addr;               //Set ISP/IAP/EEPROM address low
     
122.     IAP_ADDRH = addr >> 8;          //Set ISP/IAP/EEPROM address high
     
123.     IAP_DATA = dat;                 //Write ISP/IAP/EEPROM data
     
124.     IAP_TRIG = 0x46;                //Send trigger command1 (0x46)
     
125.     IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
     
126.     _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
     
127.     IapIdle();
     
128. }
     
129. 
     
130. /*----------------------------
     
131. Erase one sector area
     
132. Input: addr (ISP/IAP/EEPROM address)
     
133. Output:-
     
134. ----------------------------*/
     
135. void IapEraseSector(WORD addr)
     
136. {
     
137.     IAP_CONTR = ENABLE_IAP;         //Open IAP function, and set wait time
     
138.     IAP_CMD = CMD_ERASE;            //Set ISP/IAP/EEPROM ERASE command
     
139.     IAP_ADDRL = addr;               //Set ISP/IAP/EEPROM address low
     
140.     IAP_ADDRH = addr >> 8;          //Set ISP/IAP/EEPROM address high
     
141.     IAP_TRIG = 0x46;                //Send trigger command1 (0x46)
     
142.     IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
     
143.     _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
     
144.     IapIdle();
     
145. }
     
146. 
     

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打开STC的下载软件，找到范例程序，选STC89CxRC点EEPROM就行，也有汇编的