hi,

With derivative do you use? I have not found it either here or in your previous thread.

Sure, for standard derivatives no timer may be used for UART mode 0. The shifting is doing with fixed baudrate f_osc/12.
Some derivatives, for example, AT89C51RD2, allow usage of internal baud rate generator for UART mode 0 (bit SRC of BDRCON register).

Anyway, as it was already said, you may use software-made shift register (for example, based on a timer or PCA module interrupt).

Regards,
Oleg