STC90C52RC two serial ports

Good day

I am wondering if it is possible to set STC90C52 mcu to work with two serial (not at the same time)

Thank you in advance

But this processor only has 1 Uart which means only that the latter would have to be written as software or you would have to switch pins between two modules. Besides, it will still be 51 and even with an 80MHz clock it will only execute 10M instructions per second - that is, any AVR will do the same twice as fast at 16MHz. And in the case of the second teg you will find a chip that has 2 hardware items. And it is even possible that it will be compatible with the conclusions (except for the reset because it works the other way around)

This is very useful information.
Thank you for taking the time to reply.