PIC16F1824内部晶振误差10%

只看该作者 · 2017-12-6 21:09

HI各位，请教一下有没遇到PIC16F1824内部晶振偏差10%的问题，我配置内部晶振为2M，同时引出CLKOUT引脚，测出它的频率是550K，理论上应该是要2M/4也就是500K，误差10%这也太大了吧，另外有没有遇见eeprom写入数据并回读校验正常，掉电重启一下数据丢失，全是0xFF的情况？

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static void eepromWriteByte(unsigned char addr,unsigned char val){



    unsigned char gie;

    EEADRL = (unsigned char)(addr & 0xFF);

    EEDATL = (unsigned char)(val);

    EECON1bits.EEPGD = 0;

    EECON1bits.CFGS = 0;

    EECON1bits.WREN = 1;



    gie = INTCONbits.GIE;

    INTCONbits.GIE = 0;

    EECON2 = 0x55;

    EECON2 = 0xAA;

    EECON1bits.WR = 1;

    while(EECON1bits.WR);

    EECON1bits.WREN = 0;

    INTCONbits.GIE = gie;

    return;

}



static unsigned char eepromReadByte(unsigned char addr){



    EEADRL = addr;

    EECON1bits.CFGS = 0;

    EECON1bits.EEPGD = 0;

    EECON1bits.RD = 1;

    asm("nop");

    asm("nop");

    return (EEDATL);

}