Lpc2000

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

--- In lpc2000@yahoogroups.com, "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