EEPROM.rar_STC89C58_eeprom58_stc89c58 eeprom

/*------------------------------------------------------------------*/ /* --- STC MCU Limited ---------------------------------------------*/ /* --- STC89-90xx Series MCU ISP/IAP/EEPROM Demo -------------------*/ /* --- Mobile: (86)13922805190 -------------------------------------*/ /* --- Fax: 86-755-82905966 ----------------------------------------*/ /* --- Tel: 86-755-82948412 ----------------------------------------*/ /* --- Web: www.STCMCU.com -----------------------------------------*/ /* If you want to use the program or the program referenced in the */ /* article, please specify in which data and procedures from STC */ /*------------------------------------------------------------------*/ #include "reg51.h" #include "intrins.h" typedef unsigned char BYTE; typedef unsigned int WORD; /*Declare SFR associated with the IAP */ sfr IAP_DATA = 0xE2; //Flash data register sfr IAP_ADDRH = 0xE3; //Flash address HIGH sfr IAP_ADDRL = 0xE4; //Flash address LOW sfr IAP_CMD = 0xE5; //Flash command register sfr IAP_TRIG = 0xE6; //Flash command trigger sfr IAP_CONTR = 0xE7; //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<40MHz #define ENABLE_IAP 0x81 //if SYSCLK<20MHz //#define ENABLE_IAP x82 //if SYSCLK<10MHz //#define ENABLE_IAP 0x83 //if SYSCLK<5MHz //Start address for STC89C58xx EEPROM #define IAP_ADDRESS 0x08000 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<512; i++) //Check whether all sector data is FF { if (IapReadByte(IAP_ADDRESS+i) != 0xff) goto Error; //If error, break } P1 = 0xfc; //1111,1100 Erase successful Delay(10); //Delay for (i=0; i<512; i++) //Program 512 bytes data into data flash { IapProgramByte(IAP_ADDRESS+i, (BYTE)i); } P1 = 0xf8; //1111,1000 Program successful Delay(10); //Delay for (i=0; i<512; i++) //Verify 512 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 = 0x46; //Send trigger command1 (0x46) IAP_TRIG = 0xb9; //Send trigger command2 (0xb9) _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 = 0x46; //Send trigger command1 (0x46) IAP_TRIG = 0xb9; //Send trigger command2 (0xb9) _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 = 0x46; //Send trigger command1 (0x46) IAP_TRIG = 0xb9; //Send trigger command2 (0xb9) _nop_(); //MCU will hold here until ISP/IAP/EEPROM operation complete IapIdle(); }