GPIO/UART pins

michele_darold — Wed, 20 Feb 2008 00:13:38 GMT

Hi, I haven't understand a question about gpio pins and it's double function.

Example: I want to use UART0 with on TX and RX signal (no control signal needed).

I can set RX and TX for UART operation a RTS and CTS as GPIO pins?

In reference manual this is not explained well in my opinion. In the CMX_USB_LITE example UART not configured the state of RTS/CTS for UART operation but I want to be sure if this solution function.

My proc is MCF52223 but I think there is the same in all coldfire procs

Best regards

Michele Da Rold

Re: GPIO/UART pins

admin — Wed, 20 Feb 2008 17:02:44 GMT

> I want to use UART0 with on TX and RX signal (no control signal needed).
> I can set RX and TX for UART operation a RTS and CTS as GPIO pins?

Yes, you can use TXD and RXD for UART, with RTS and CTS are configured as GPIO. Check in MCF52223 manual, if configuring CTS as GPIO causes disable CTS-to-TXD dependency (as in PowerQUICC family). If no, you will need to disable CTS-to-TXD dependency in the concerned UART register.

ColdFire/68K Microcontrollers and ProcessorsのトピックGPIO/UART pins

GPIO/UART pins

Re: GPIO/UART pins