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'[PIC]: 16C84 RA1 depends on RA2 ?'
2000\08\25@160545 by Thomas Krampe

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Hi,

i am a newbie in PIC handling/programming. So far i getting few light flashing,
but i run in a strange problem.
I am using (16C84)on porta (0..3) for output purpose, but the RA1 goes only to a
high, if RA2 is also set to high level. If i set RA2 as an input Ra1 reacts fine.
A second 16C84 shows the same phenomenon, but such behavior should not happened.

So could someone give me a clue what i am doing wrong ?

thanks in advance,
Thomas

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2000\08\25@162907 by Greg Maki

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Thomas Krampe wrote:
>
> Hi,
>
> i am a newbie in PIC handling/programming. So far i getting few light flashing,
> but i run in a strange problem.
> I am using (16C84)on porta (0..3) for output purpose, but the RA1 goes only to a
> high, if RA2 is also set to high level. If i set RA2 as an input Ra1 reacts fine.
> A second 16C84 shows the same phenomenon, but such behavior should not happened.
>
> So could someone give me a clue what i am doing wrong ?
>
> thanks in advance,
> Thomas

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.

Hope this helps!

Greg Maki

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