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Implementing RS232/UART with GPIOs on ADUC702X ARM uC

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Hi,

I'm using aduc7022 microcontroller custom board and I have two GPIO pins (SPM4, SPM5) I want to use as RS232 Tx and Rx. (https://www.keil.com/dd/docs/datashts/adi/aduc702x_ds.pdf)

Is there any white paper, a reference source or any kind of information that might be useful on these kind of microcontrollers about implementing RS232 on GPIO ports ?

Thank you for your help in advance,
 

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