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Size of Pointer to Constant Table

cheng teh kian

I would like to know how can we control the size of the pointer that point to RAM area.

UByte *RamAdr;
For code above, I found that the pointer size is different in 2 different software (1 software use 2Bytes to reference RAM area while the other one use 3Bytes

How to control size of Pointer to RAM area

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  • 0

    hi,

    to control the size of pointer you should define the type of area which pointer shows on.

    For example:

    unsigned char idata *RamAdr; //uses one byte for pointer (due MOV @Ri)
unsigned char xdata *RamAdr; // uses two bytes (MOVX @DPTR)
unsigned char *RamAdr; // uses three bytes
    Last example is your case. Here, the third byte is used to indicate type of memory area where data are placed in real application.

    Regards,
    Oleg

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  • 0

    hi,

    to control the size of pointer you should define the type of area which pointer shows on.

    For example:

    unsigned char idata *RamAdr; //uses one byte for pointer (due MOV @Ri)
unsigned char xdata *RamAdr; // uses two bytes (MOVX @DPTR)
unsigned char *RamAdr; // uses three bytes
    Last example is your case. Here, the third byte is used to indicate type of memory area where data are placed in real application.

    Regards,
    Oleg

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