Lpc2000

--- In lpc2000@yahoogroups.com, John Stamos <jstamos111@...> wrote:
>
> I want to use one of them as input to a CPLD and the others I want
to take input from the CPLD so sounds like I should use 4.7K (thanks).
 If I am going to use the pin as input do you think I still need the
resistor or will I need it for both input and output of the pins?
>    
>   Thanks again.

"input to" and "input from" are somewhat ambiguous.  So, you want to
use one pin as an output to drive the input of a CPLD.  If this is an
open collector pin on the LPC then you need a pull-up resistor - 4.7k
should do fine.

For the others, you want to define them as inputs and drive them from
the outputs of a CPLD.  No problem.  As long as the CPLD is not
configured for open collector outputs, you won't need pull-up resistors.

I'm assuming the CPLD is also running at 3.3V.

Richard