Sometimes we need to exchange data between two MCUs through opto
coupler (or magnetic coupler from Analog Device). If both side have SPI or
I2C or UART, then we will normally use these resources. However we may
not have these features (or they have better things to do), then we might
think of using  two port pins for serial communication(software UART).

Here is once question, if we need relative high speed, say to transmit
8 bytes of data (64bits) continuously per 1ms (>=64kbps). We might also
need to use certain encoding method so that it is more immune to noise. Is
this easily doable with small MCUs like small PIC16Fs running the internal
RC oscillator of 8MHz or 4-clock-per-instruction 8051s running at 20MHz
crystal? Is it easily doable with an MSP430 with internal calibrated 16Mhz
oscillator (single clock per instruction but clock tolerance is +/-5% over
all temperature)? Will this kind of serial communication make the MCU
fully occupied?

Regards,
Xiaofan
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