STC原版EEPROM修改方法

1.  C程序：
;STC 12C5A60S2系列单片机EEPROM/IAP 功能测试程序演示
/*------------------------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------- ---------------------------------------*/
/* --- 演示STC 1T  系列单片机 EEPROM/IAP 功能--------------------------*/
/* --- Mobile: (86) 13922809991 -----------------------------------------------*/
/* --- Fax: 86-755-82905966 ---------------------------------------------------*/
/* --- Tel: 86-755-82948412 ----------------------------------------------------*/
/* --- Web: www.STCMCU.com -----------------------------------------------*/
/* 如果要在程序中使用或在文章中引用该程序， --------------------  ---*/
/* 请在程序中或文章中注明使用了STC的资料及程序 -----------*/
/*-------------------------------------------------------------------------------------*/
#include "reg5 1.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
/*Declare SFR associated with the IAP */
sfr  IAP_DATA      =   0xC2;       //Flash data register
sfr  IAP_ADDRH     =   0xC3;             //Flash address HIGH
sfr  IAP_ADDRL     =   0xC4;               //Flash address LOW
sfr  IAP_CMD       =   0xC5;                //Flash command register
sfr  IAP_TRIG       =   0xC6;                 //Flash command trigger
sfr  IAP_CONTR     =   0xC7;             //Flash control register
/*Define ISP/IAP/EEPROM command*/
#define   CMD_IDLE      0                         //Stand-By
#define   CMD_READ      1                      //Byte-Read
#define   CMD_PROGRAM   2                 //Byte-Program
#define   CMD_ERASE      3                      //Sector-Erase
/*Define ISP/IAP/EEPROM operation const for IAP_CONTR*/
//#define   ENABLE_IAP   0x80              //if SYSCLK<30MHz
//#define   ENABLE_IAP   0x81              //if SYSCLK<24MHz
#define   ENABLE_IAP    0x82              //if SYSCLK<20MHz
//#define   ENABLE_IAP   0x83              //if SYSCLK< 12MHz
//#define   ENABLE_IAP   0x84              //if SYSCLK<6MHz
//#define   ENABLE_IAP   0x85              //if SYSCLK<3MHz
//#define   ENABLE_IAP   0x86              //if SYSCLK<2MHz
//#define   ENABLE_IAP   0x87              //if SYSCLK< 1MHz
//Start address for STC12C5A60S2 series EEPROM
#define    IAP_ADDRESS   0x0000
void Delay(BYTE n);
void IapIdle();
BYTE IapReadByte(WORD addr);

void IapProgramByte(WORD addr, BYTE dat);
void IapEraseSector(WORD addr);
void main()
{
      WORD i;
      P1 = 0xfe;                                                  // 1111 ,1110 System Reset OK
      Delay(10);                //Delay
      IapEraseSector(IAP_ADDRESS);          //Erase current sector
      for (i=0; i<5 12; i++)                                //Check whether all sector data is FF
      {
            if (IapReadByte(IAP_ADDRESS+i) != 0xff)
                goto Error;                                    //If error, break
      }
      P1 = 0xfc;                                               // 1111 ,11 00 Erase successful
      Delay(10);                                             //Delay
      for (i=0; i<5 12; i++)                             //Program 5 12 bytes data into data flash
      {
            IapProgramByte(IAP_ADDRESS+i, (BYTE)i);
      }
      P1 = 0xf8;                                           // 1111 ,1000 Program successful
      Delay(10);                                       //Delay
      for (i=0; i<5 12; i++)                          //Verify 5 12 bytes data
      {
            if (IapReadByte(IAP_ADDRESS+i) != (BYTE)i)
                goto Error;                             //If error, break
      }
      P1 = 0xf0;                                        // 1111 ,0000 Verify successful
      while ( 1);
Error:
      P1 &= 0x7f;                                  //0xxx,xxxx IAP operation fail
      while ( 1);
}
/*----------------------------Software delay function
----------------------------*/
void Delay(BYTE n)
{
      WORD x;
      while (n--)
      {
            x = 0;
            while (++x);
      }
}

/*----------------------------Disable ISP/IAP/EEPROM function
Make MCU in a safe state
----------------------------*/
void IapIdle()
{
      IAP_CONTR = 0;       //Close IAP function
      IAP_CMD = 0;              //Clear command to standby
      IAP_TRIG = 0;                       //Clear trigger register
      IAP_ADDRH = 0x80;                  //Data ptr point to non-EEPROM area
      IAP_ADDRL = 0;                      //Clear IAP address to prevent misuse
}
/*----------------------------Read one byte from ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
Output:Flash data
----------------------------*/
BYTE IapReadByte(WORD addr)
{
      BYTE dat;                           //Data buffer
      IAP_CONTR = ENABLE_IAP;   //Open IAP function, and set wait time
      IAP_CMD = CMD_READ;         //Set ISP/IAP/EEPROM READ command
      IAP_ADDRL = addr;                  //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;        //Set ISP/IAP/EEPROM address high
      IAP_TRIG = 0x5a;                  //Send trigger command 1 (0x5a)
      IAP_TRIG = 0xa5;                    //Send trigger command2 (0xa5)
      _nop_();                            //MCU will hold here until ISP/IAP/EEPROM
          //operation complete
      dat = IAP_DATA;              //Read ISP/IAP/EEPROM data
      IapIdle();                          //Close ISP/IAP/EEPROM function
      return dat;                          //Return Flash data
}
/*----------------------------Program one byte to ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
       dat (ISP/IAP/EEPROM data)
Output:-----------------------------*/

void IapProgramByte(WORD addr, BYTE dat)
{
  IAP_CONTR = ENABLE_IAP;          //Open IAP function, and set wait time
      IAP_CMD = CMD_PROGRAM;     //Set ISP/IAP/EEPROM PROGRAM command
      IAP_ADDRL = addr;                  //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;             //Set ISP/IAP/EEPROM address high
      IAP_DATA = dat;                    //Write ISP/IAP/EEPROM data
      IAP_TRIG = 0x5a;                    //Send trigger command 1 (0x5a)
      IAP_TRIG = 0xa5;                    //Send trigger command2 (0xa5)
      _nop_();                            //MCU will hold here until ISP/IAP/EEPROM 
          //operation complete
      IapIdle();
}
/*----------------------------Erase one sector area
Input: addr (ISP/IAP/EEPROM address)
Output:-----------------------------*/
void IapEraseSector(WORD addr)
{
      IAP_CONTR = ENABLE_IAP;   //Open IAP function, and set wait time
      IAP_CMD = CMD_ERASE;       //Set ISP/IAP/EEPROM ERASE command
      IAP_ADDRL = addr;                //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;          //Set ISP/IAP/EEPROM address high
      IAP_TRIG = 0x5a;                    //Send trigger command 1 (0x5a)
      IAP_TRIG = 0xa5;                    //Send trigger command2 (0xa5)
      _nop_();                            //MCU will hold here until ISP/IAP/EEPROM 
          //operation complete
      IapIdle();
}