eeprom读写问题

catbal

 为啥我的eeprom写进去之后断电 一段时间第一次通电读取出来数据时正确的 再一次断电一段时间第二次通电读出数据时错误的

#include "eeprom.h"


/*----------------------------
Disable ISP/IAP/EEPROM function
Make MCU in a safe state
----------------------------*/
void IAPIDLE(void)
{
    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
----------------------------*/
tbyte IAPReadByte(tword addr)
{
    tbyte dat;                       //Data buffer

IAP_DATA=0x00;
    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 command1 (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(tword addr, tbyte 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 command1 (0x5a)
    IAP_TRIG = 0xa5;                //Send trigger command2 (0xa5)
    _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
    _nop_();
_nop_();
IAPIDLE();
}

/*----------------------------
Erase one sector area  ???????é???ò
Input: addr (ISP/IAP/EEPROM address)
Output:-
----------------------------*/
void IAPEraseSector(tword 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 command1 (0x5a)
    IAP_TRIG = 0xa5;                //Send trigger command2 (0xa5)
    _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
    IAPIDLE();

}