Mplab Xc8 Pic Assembler User 39-s Guide Jun 2026

Forget CODE and DATA directives from old assemblers. XC8 uses (Program Sections). The guide dedicates an entire chapter to this. You must define a PSECT for your code, like:

; Code PSECT myRoutine, class=CODE, reloc=2 myFunction: movlw 0x05 movwf counter return

The biggest conceptual leap in the MPLAB XC8 PIC Assembler User's Guide is (Program Sections). In MPASM, you simply wrote code at an absolute address ( org 0x00 ). In XC8 assembly, you define relocatable sections. mplab xc8 pic assembler user 39-s guide

#include <xc.h> void main(void) asm("BANKSEL PORTA"); asm("BSF PORTA, 0");

: Allows for single-step assembly and linking of source files using command-line options. Forget CODE and DATA directives from old assemblers

Accessing these registers requires awareness of Banking (for PIC16) or the Access Bank (for PIC18). The XC8 assembler provides the BANKSEL directive to automatically generate the code needed to switch memory banks. Forgetting to manage banks is the most common source of bugs in PIC assembly programming. Integrating Assembly with C

PSECT code, class=CODE

If you skip this, your assembly won’t link correctly.

Labels must start in the first column and are followed by a colon. Instructions and directives must be indented. Comments begin with a semicolon or double forward slashes. You must define a PSECT for your code,