Inputs left floating at the very start


In college, I was always told not to leave input pins floating on a
device such as a 74HCT chip. I was told that the device might behave
erratically if any of its inputs are floating.

I have the PIC16F684. One of its inputs goes to the data input of a
shift register, and the other goes to the clock input of the same
shift register.

On the shift regsiter, there's an RC circuit on the master reset with
a charge time of about a microsecond (which is plenty slow enough to
have it set to all zeroes initially).

When the PIC boots up, all of its IO pins are set as inputs initially.
What I'm concerned about though is that shift register's input pins
must be either high or low, so I'm wondering if I'll get erratic
behaviour at the very start because the pins are effectively floating?
.

Relevant Pages

  • Re: Inputs left floating at the very start
    ... erratically if any of its inputs are floating. ... shift register, and the other goes to the clock input of the same ... there's an RC circuit on the master reset with ... all of its IO pins are set as inputs initially. ...
    (comp.arch.embedded)
  • Re: Inputs left floating at the very start
    ... I was told that the device might behave ... erratically if any of its inputs are floating. ... shift register, and the other goes to the clock input of the same ... all of its IO pins are set as inputs initially. ...
    (comp.arch.embedded)
  • Re: shift regester
    ... you better don't use a simple add with a shift register: ... inaccuracy of floating point numbers you easily get into trouble (try ...
    (comp.lang.labview)