How to define bytes in the upper ram bank (0x100-17F)?

[adib]

Posted on March 31, 2004 at 14:52

How to define bytes in the upper ram bank (0x100-17F)?

[adib]

Posted on March 28, 2004 at 20:29

Hi,

I am trying to define a byte wide variable in the 16 bit address area of the RAM.

When I use ''label DS.B 1'' I get:

''Error 84: Byte Size label has val > 255! (need WORDS?)''

When I use ''DS.W'' it compiles but the variable is a word!

Please advise......

[marco32]

Posted on March 29, 2004 at 04:38

If you define the 16 bit RAM section as WORD, you can the registers define as byte!

The next code is working!

Code:

WORDS

segment 'ram1' ;Registers define in RAM1 location

;/* Next adresses are 16 bits */

;/* Be carefull, the next RAM registers */

;/* Do not proceed commands, like */

;/* SLA, CLR, INC */

Message DS.B 1 ;Message

[shreya]

Posted on March 29, 2004 at 08:54

Basically you have missed out the ''WORDS'' qualifier. It tells the assembler, ''the following bytes have to be addressed using 16-bits. You must have defined in the following way :

segment 'ram0'

BYTES

temp ds.b 1

segment 'ram1'

label ds.b 1

The BYTES says that label uses 8-bit addressing while it is NOT in zer page, hence the error. Adding ''WORDS'' below ''segmnet 'ram1' '' will solve your problem.

[adib]

Posted on March 31, 2004 at 14:52

Thanks very much! it solved the problem.