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Old June 12th, 2007, 09:20 PM
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Default assembly code help

i have this code that does the following
;The following program, in assembly language of the pic16f84A microcontroller, configures the three
; lower pins of PORTA(RA0, RA1 and RA2) as inputs, and the pins of PORTB as output. The program then
;enters a non-terminating loop. in the loop program read the three input lines, interpret the input as
;a 3 bit binary value(RA0 as the least significant bit), and make PORTB line corresponding to the
;input value 'on' by outputting the value '1' on this line.
;All other output lins must remain '0'.
the code is

PCL: EQU 0x02

W: EQU 0
F: EQU 1

    ORG 0x0
    goto MAIN
    org 5

    clrf PORTA
    clrf PORTB
    movlw B'00000111'
    iorwf TRISA,F ;RA0-RA2 as input
    clrf TRISB ;Port B0-B7 as output

    movf PORTA, W
    andlw B'00000111'
    call TABLE
    movfw PORTB
    goto LOOPX

    addwf PCL, F
    retlw B'00000001'
    retlw B'00000010'
    retlw B'00000100'
    retlw B'00001000'
    retlw B'00010000'
    retlw B'00100000'
    retlw B'01000000'
    retlw B'10000000'

iam wondering if anyone can help to modify the above code so it does following
the qestion is
in this question. de-multiplexer has an input line, pinRB0, and four output
lines, output0 to output3, which are, respectively, the pins RA0-RA3. the
demultiplexer copies the digital signal appearing on the input line on to one of
the four output lines. The output line is selected by a two bit
selection code input on the pins RB1 and RB2
END OF QUESTION......................Code this in assembly

Please reply soon: smsrks2007@gmail.com

  #2 (permalink)  
Old June 20th, 2007, 05:34 AM
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please can anyone help me out


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