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   1. Trim value = RCTRIM0(HIRCTRIM[8:1]) + RCTRIM1(HIRCTRIM[0])

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  sfr RCTRIM0 = 0x84;

  sfr RCTRIM1 = 0x85;

  bit BIT_TMP;

   

  #define set_IAPEN  BIT_TMP = EA; EA=0; TA=0xAA; TA=0x55; CHPCON |= SET_BIT0; EA= BIT_TMP

  #define set_IAPGO  BIT_TMP = EA; EA = 0; TA = 0xAA; TA = 0x55; IAPTRG |= SET_BIT0; EA = BIT_TMP

  #define clr_IAPEN  BIT_TMP = EA; EA = 0; TA = 0xAA; TA = 0x55; CHPCON &= ~SET_BIT0; EA=BIT_TMP

   

  unsigned char hircmap0,hircmap1;

  unsigned int trimvalue16bit;

   

  void MODIFY_HIRC_VLAUE(void)

  {

      set_IAPEN;

      IAPAL = 0x30;

      IAPAH = 0x00;

      IAPCN = READ_UID;

      set_IAPGO;

      hircmap0 = IAPFD;

      IAPAL = 0x31;

      IAPAH = 0x00;

      set_IAPGO;

      hircmap1 = IAPFD;

      clr_IAPEN;

      trimvalue16bit = ((hircmap0<<1)+(hircmap1&0x01));

      trimvalue16bit = trimvalue16bit - 15;

      hircmap1 = trimvalue16bit&0x01;

      hircmap0 = trimvalue16bit>>1;

      TA=0XAA;

      TA=0X55;

      RCTRIM0 = hircmap0;

      TA=0XAA;

      TA=0X55;

      RCTRIM1 = hircmap1;

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