SET/EQU Example

SET/EQU Example

Directives highlighted in this example are:

• set

equ

Program Functional Description

This example shows the the usage of the set directive, used for creating symbols which may be used in MPASM assembler expressions only. The symbols created with this directive do not occupy any physical memory location of microcontroller.

Commented Code Listing

list p=16f877 ;Select the device.

#include <p16f877.inc> ;Include standard header file

;for the selected device.

perimeter set 0 ;The label 'perimeter' is

;assigned value 0.

area set 0 ;The label 'area' is assigned

;value 0.

lngth equ 50H ;The label 'lngth' is assigned

;the value 50H.

wdth equ 25H ;The label 'wdth' is assigned

;the value 25H.

perimeter set 2*(lngth+wdth) ;Both 'perimeter' and

area set lngth*wdth ;'area' values are

;reassigned.

end