macro usage PIC assembly

A group of instructions that are grouped together and assigned a name.
One or multiple arguments can be input to a macro.
By entering the macro name, the same group of instructions can be duplicated
in any place of the program.
User program is made more readable by using macros.
User becomes more productive by saving the text entering time.

Macro Directives

macro
endm
exitm

Macro Definition Examples

Code:

eeritual macro ; macro name is eeritual
movlw 0x55 ; instruction 1
movwf EECON2 ; instruction 2
movlw 0xAA ; instruction 3
movwf EECON2 ; instruction 4
endm

Macro Call Example

Code:

eeritual ; this macro call causes the
; assembler to insert
; instruction 1 … instruction 4

Another Examlpe

Code:

sum_of_3 macro arg1, arg2, arg3 ; WREG <- [arg1]+[arg2]+[arg3]
movf arg1,W,A
addwf arg2,W,A
addwf arg3,W,A
endm
sum_of_3 0x01, 0x02, 0x03 ; WREG <- [0x01] + [0x02] + [0x03]

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M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
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