Interrupt driver uart

Hi,

I need to program an old 8051 board with an AT89C51CC03. I like to write my own interrupt driven serial port (UART) function without using some library function like printf() or putchar().

I get timer1 running and generating interrupts. I get the uart running and generating interrupts. But...

...one thing I don't understand:
- on the one hand timer1 can be programmed somehow as a baudrate generator for the serial port? (how?)
- on the other hand, the uart has it's own FUart Clock signal derived directly from XTal

I do not see where the connection lays between timer1 as a baudrate generator and the uart transceiver speed...

I searched through the uC datasheet many times and read many Internet articles but still did not found the answer.

Hope someone can help me out.

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