请问使用CH552T的Data存储数据，发现掉电，上电存储的数据变，请问有什么好办法？晶振频率24M

您好，代码中用到DataFlash一般也会有写Flash的函数在代码中，要注意上下电过程芯片不正常的时候代码跑飞的风险，意外进入Flash写函数。

extern UINT8 FLASH_CHECK_BYTE_1;

extern UINT8 FLASH_CHECK_BYTE_2;

UINT8 UserDefFlashErase( UINT16 Addr, UINT16 len )

{

    bit e_all;

    UINT8 status;                                    /* 返回操作状态 */

    UINT8 FlashType;                                 /* Flash 类型标志 */

    UINT16 addr = Addr+UserDefineFlashAddr;

    UINT16 restlen = len;

    /* 判断是否可以正常执行FLASH操作 */

    if( ( FLASH_CHECK_BYTE_1 != DEF_FLASH_OP_CHECK1 ) && ( FLASH_CHECK_BYTE_2 != DEF_FLASH_OP_CHECK2 ) )

    {   //FLASH_CHECK_BYTE_1和FLASH_CHECK_BYTE_2通常在USB中断中满足一定条件置位，或者在GPIO中断中置位，这个标志的置位来源一定是芯片外部操作实现的，防止自己就擦写了

        return 0x02;

    }

    if((addr>=DATA_FLASH_ADDR) && (addr/* DataFlash区域 */

    {

        FlashType = bDATA_WE;

    }

    else                                             /* CodeFlash区域 */

    {

        FlashType = bCODE_WE;

    }

    SAFE_MOD = 0x55;                                 /* 进入安全模式 */

    SAFE_MOD = 0xAA;

    //下面就是FLASH的擦（554以下不需要擦）、写、读

    //操作结束之后FLASH_CHECK_BYTE_1和FLASH_CHECK_BYTE_2及时复位

    GLOBAL_CFG |= FlashType;

        do

        {

            ROM_ADDR = addr;                                 /* 写入目标地址 */

                ROM_BUF_MOD = bROM_BUF_BYTE;                     /* 选择块擦除模式或单字节编程模式 */

                ROM_DAT_BUF = 0;                                 /* 擦写数据缓冲区寄存器为0 */

                if ( ROM_STATUS & bROM_ADDR_OK )                 /* 操作地址有效 */

                {

                        ROM_CTRL = ROM_CMD_ERASE;                    /* 启动擦除 */

                        if(ROM_STATUS & bROM_CMD_ERR)

                        {

                                status = 0x02;    /* 未知命令或超时 */

                                return status;

                        }

                        else

                        {

                                status = 0x00;    /* 操作成功 */

                        }

                }

                else

                {

                        status = 0x01;    /* 地址无效 */

                        return status;

                }

                addr += 64;

                if( restlen >= 64 )

                {

                    restlen -= 64;

                }

                else if( restlen < 64 )

                {

                    restlen = 0;

                }

        }while( restlen );

    SAFE_MOD = 0x55;                                 /* 进入安全模式 */

    SAFE_MOD = 0xAA;

    GLOBAL_CFG &= ~FlashType;                        /* 开启写保护 */

    EA = e_all;                                      /* 恢复全局中断状态 */

        CH549WDTModeSelect(1);                           /* 启动看门狗 */

    return status;

}