How to write a simple asm for adding 2 numbers using PIC16f877?

[deardeepa76]

I want to write a simple asm program for PIC 16F877 to add 2 numbers. I am using MPLab IDE

Please help me, I am trying to learn the basics

Reg,
Deepa

 

[betwixt]

Assuming you are dealing with 8-bit integers, basically all you do is this:

Create a variable to hold the result, it should have an upper byte and a lower byte.
load the first number into W
add it to the lower result byte
load the second number into W
add it to the lower result byte
if the carry flag is set, increment the upper result byte.

The result is then in the upper and lower result bytes.

Brian.