STC原版EEPROM修改方法

1. C程序：
;STC 12C5A60S2系列單片機EEPROM/IAP 功能測試程序演示
/*------------------------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------- ---------------------------------------*/
/* --- 演示STC 1T 系列單片機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該程序， -------------------- ---*/
/* 請在程序中或文章中注明使用了STC的資料及程序 -----------*/
/*-------------------------------------------------------------------------------------*/
#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();
}