Greg Maki wrote:

>
> Thomas,
>
> You may be running into the old read-modify-write problem when doing
> sucessive operations on an I/O port. You may want to look in the data
> book for a paragraph entitled "Sucessive Operations on I/O Ports" to get
> the details. Basically, you need to seperate I/O operations with some
> instructions to allow the port pins to stabilize before performing
> another operation on them.

Hi Greg and everyone else,

thank you for your answer, but this solved not my problem.

here is a short progam showing my problem:

But why is not going RA1 to the high level ?

        list p=16C84
port    equ 0x05

start   movlw   0x10
        tris    port
        movlw   0x00
        option
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
m_loop  movlw   0x03 ; Ra0 goes to high but Ra1 is staying low, Why ?
        movwf   port
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        goto    m_loop

        end;

--
Thomas

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