UART1 I/O Pins

Started by Chris May 24, 2004
Uart1 supports many modem control signals, but I only need TXD and
RXD.

I understand from the archives that SPI will not work unless all
(four) of its signals are actually enabled on physical I/O pins. I'm
hoping this is not also true for uart1, which would waste many pins.

Is it possible (on the LPC2106) to enable uart1 but not enable all
the signals to be connected to external I/O pins? - Chris Graham




An Engineer's Guide to the LPC2100 Series

--- In , "Chris" <chris_e_gr@y...> wrote:
> Uart1 supports many modem control signals, but I only need TXD and
> RXD.
>
> I understand from the archives that SPI will not work unless all
> (four) of its signals are actually enabled on physical I/O pins.
I'm
> hoping this is not also true for uart1, which would waste many
pins.
>
> Is it possible (on the LPC2106) to enable uart1 but not enable all
> the signals to be connected to external I/O pins?

If I've read the User Manual correctly (page 78), I think that is the
case. You can set up the PINSEL0 register so that P0.8 is UART1 TxD
and P0.9 is UART1 RxD, and keep the unused UART1 pins as GPIO.

Leon