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open drain + pullup + io not working ???

Started by omkar vyas June 29, 2006
My design is working now!

ARM LPC2104 board!

but now total 6 I/O pins are not giving output!!!

i have sent square wave as a output on all 32 ios but few pins are not giving any output.

and also i have pulled each pin high with 10k of Resistance!

by this my few pins r now giving output but still 6 pins r not giving any output!!!

!

is there is any provision to pull up a pin internally???

how many pins actually needs pullup resistance ideally???

port numbers are(P.27,P.28,P.29,P.24,P.21,P.31) THESE R THOSE 6 I/O PINS WHICH ARE AT GROUND POTENTIAL!!!

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An Engineer's Guide to the LPC2100 Series

If your dbgsel pin is pulled high at reset then you lose control of
P0.17-P0.31 as they are used for jtag and trace. Anyway, all that is in
the user manual.

*Peter*

omkar vyas wrote:
> My design is working now! ARM LPC2104 board!
>
> but now total 6 I/O pins are not giving output!!!
>
> i have sent square wave as a output on all 32 ios but few pins are not
> giving any output.
>
> and also i have pulled each pin high with 10k of Resistance! by this my few pins r now giving output
> but still 6 pins r not giving any output!!! > potential> ! is there is any provision to pull up a pin internally???
>
> how many pins actually needs pullup resistance ideally???
>
> port numbers are(P.27,P.28,P.29,P.24,P.21,P.31) THESE R THOSE 6 I/O PINS
> WHICH ARE AT GROUND POTENTIAL!!!

Peter thankx man now its working only i ahve kept it open Debugsel pin is open for normal opretion that pin is intarnally pulled down so ...np need for external puul up

Peter Jakacki wrote: If your dbgsel pin is pulled high at reset then you lose control of
P0.17-P0.31 as they are used for jtag and trace. Anyway, all that is in
the user manual.

*Peter*

omkar vyas wrote:
>
>
> My design is working now!
>
> ARM LPC2104 board!
>
> but now total 6 I/O pins are not giving output!!!
>
> i have sent square wave as a output on all 32 ios but few pins are not
> giving any output.
>
> and also i have pulled each pin high with 10k of Resistance!
>
> by this my few pins r now giving output
> but still 6 pins r not giving any output!!! > potential>
>
> !
>
> is there is any provision to pull up a pin internally???
>
> how many pins actually needs pullup resistance ideally???
>
> port numbers are(P.27,P.28,P.29,P.24,P.21,P.31) THESE R THOSE 6 I/O PINS
> WHICH ARE AT GROUND POTENTIAL!!!






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