Long Indirect Indexed Addr.Mode

[hkurt]

Posted on April 08, 2004 at 03:46

Long Indirect Indexed Addr.Mode

[hkurt]

Posted on April 07, 2004 at 11:36

As far as I understud, the definition of the pointr in the statement

ld A,([pointr.w],X)

should be in the 8-Bit region of the code memory.

The code memory of the STLITE29 starts at $E000.

Are the first 256-byte of this memory 8-Bit addresses?

can anyone ''enlightening'' me?

[jatin]

Posted on April 07, 2004 at 14:57

Please refer table ''ST7 Addressing Mode Overview'' in the datasheet.

For ld A,([pointr.w],X):

Mode - Long Indirect Indexed

Destination/Source - 0000..FFFF

Pointer Address- 00..FF

Pointer Size- word

[hkurt]

Posted on April 07, 2004 at 19:24

you have not answered my question. I have looked there, but I couldn't understand. Is the pointer RAM or Code memory?

If it is code memory, where I have 8-Bit address in the ST7LITE29? Is it in the range $E000 - $E0FF ?

If it is RAM have I to load the 16-Bit address fist in RAM, like

ld A,{high TABLE}

ld $80,A

ld A,{low TABLE}

ld $81,A

pointr EQU $80

X = 0

ld A,([pointer.w],X) -> reads the first Byte of TABLE

is that correct ?

Can you give a sample?

Quote:

On 2004-04-07 18:27, Jatin wrote:

Please refer table ''ST7 Addressing Mode Overview'' in the datasheet.

For ld A,([pointr.w],X):

Mode - Long Indirect Indexed

Destination/Source - 0000..FFFF

Pointer Address- 00..FF

Pointer Size- word

[jatin]

Posted on April 08, 2004 at 03:46

The pointer is in the ram0 page of the memory which means the pointer address is a byte.

Yes, You can do it in the same manner you have done.