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in 8951 there are two timers you can use one for baud rate generation and the other for your purpose. If you require one more timer then u can use 8952 which has three timers.
for transmitting/receiving lot of data i wouldn't recommend bit banging as it much of the processors time, check this link on bit banging https://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Bit-Banging.html
Hi,
I feel if the UART function and the other function requiring the timer can be time multiplexed, I feel you can use the same timer for both by calling the Timer init for each case before calling the respective function.
Although unlikely, in some very rare applications it might be viable to use the timer serving as a baudrate generator also as a timer, simply enabling its interrupt (and reducing most of the interrupts to a mere djnz SlowDownCounter,xxx; xxx: reti); although if baudrate is anything faster than say 2400 Bauds, the performance penalty associated with doing this would be detrimental.
Also, some applications might accomodate UART in mode 2, where baudrate is generated without timer, directly from oscillator. A relatively slow crystal is needed for this, and a counterpart able to communicate in 9-bit format (e.g. 8-bit and parity, or 8 bit and 2 stopbits).
The most viable option is, as said above, using a '52 with T2; or, if more timers needed, a derivative (such as some member of the 'RD2 sub-family) with the PCA unit.
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