GET STARTED WITH PIC18F2550 PROGRAMMING IN ASSEMBLER AND BIT CONFIGURATION

In this post, I want to share how to write a program in assembler to get started with PIC18F2550 and MPLAB X.

The program can be segmented into 3 parts. The First part is PIC selection through the list and include reserved words.

The second part of the program is the bit configurations.

Finally, the 3rd part of the program is the application program. In this sample, I only get a toggle in the PORT RC0.

Enjoy your first program and please remember that I can teach you or help you with your projects, you can contact me at:

postgraduatecahg@gmail.com

list p=18f2550
include "P18F2550.INC"
   
 CONFIG FOSC = HS ;HS crystal oscilator 8MHz
 CONFIG MCLRE = ON ; enable Master Clear
 CONFIG BOR = OFF ;Brown-out OFF
 CONFIG PWRT = OFF; Power-up Timer OFF
 CONFIG LVP = OFF ;Low-Voltage programming disabled (necessary for debugging) 
 CONFIG WDT = OFF ;disable watchdog timer
 CONFIG PBADEN = OFF ;This is to confing ADC converter check the datasheet
 CONFIG CP0 = OFF ;No code protection  
 CONFIG CP1 = OFF;
 CONFIG CP2 = OFF;
 CONFIG CP3 = OFF;
 CONFIG CPB = OFF;
 CONFIG CPD = OFF;

 ORG 0x00
 GOTO START
 ORG 0x50

 START
    CLRF PORTC ; Clear PORTC.
    CLRF TRISC ; PORTC is confired as outputs.
 MAIN
    BTG PORTC, RC0 ; RC0 Bit toggle.
    GOTO MAIN ; Goto to main address.
    END
 
 

For further information about the bit configuration, you can search in the datasheet and in the next link.

https://openlabpro.com/guide/configuration-bits-for-pic18f4550/