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Coding standards: EQU vs DS

Douglas Hewett

(1) Is there a coding standard for 8051 assembler regarding use of:

foo equ 80h   ; some idata

and

foo:  ds 1
?

(2) What is your opinion?

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    The two statements have different purposes, and are not interchangeable. "Equ" defines a symbolic constant to help make the code readable and maintainable. "Ds" reserves memory for a variable.

    Equ would be appropriate for addresses that never move, such as SFRs or well-known fixed memory locations. Ds would be better for declaring various variables where you do not really care exactly where the variable lives, so long as you can find the space you need.

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    The two statements have different purposes, and are not interchangeable. "Equ" defines a symbolic constant to help make the code readable and maintainable. "Ds" reserves memory for a variable.

    Equ would be appropriate for addresses that never move, such as SFRs or well-known fixed memory locations. Ds would be better for declaring various variables where you do not really care exactly where the variable lives, so long as you can find the space you need.

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