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Asked: 2026-06-12T15:29:52+00:00

Goodday to you all; I started with programming of a pic for 2 days

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Goodday to you all;

I started with programming of a pic for 2 days now;
And have a question about assembly, i have a PIC 16F887a on a EASYPIC7 (development) board.
I try to read the buttons on PORTB and direct them to PORTC.

So i tought i do:

movlw PORTB ; mov value of PORTB to "W file" (depents on which switches are pressed)

;and direcly after that

movwf PORTC ; mov value of "W file" to PORTC and should light up the led's

But no luck,
Can this work (and did i setup the PIC wrong) or can this not work and if so why not ?

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1 Answer

  1. Editorial Team

    movlw places a literal value in WREG. This means that the value is a constant, determined at assembly time. movlw PORTB places the low byte of the address of PORTB in WREG, not the value of PORTB. To get the value, you need to use the movf instruction.

    movf PORTB, W ; Place the value of PORTB in WREG
movwf PORTC   ; Store WREG into PORTC
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