Uart using mode 3

Hellow

I have a project now, using Atmel's AT89C51RE2 as MCU.
I've already checked each UART(UART0, UART1) worked alone in mode 1, but I need 2 uarts works simultaneously.
I heard for both uarts working, each uart configuration has different baud rate, and different mode, is it correct?
anyway, I tried to make uart work in mode 3, but I failed.
Could you give me any advice ?? (or eg?)

thank you.

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