serial transfer with c in assembler

hi members...

i'm programming assembler and likewise c.
a practical training force me to write assembler in c.
the serial port names P3.1 and i can send every time 8 bit (2bit = start- and stopbit and the last 6 bit's are data).
i must abide the exactly speed (baudrate) for my pc and microcontroller.
in assembler is that very easy because i can use the cycle's.
i have realized the delay with loops in c but the loops are very inexactly!
i've got the answer to use the processortime or related.
How!?!?!

thank's for you sympathy

yours sincerely

nick

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