along with IE.7 to enable serial interrupt. If necessary, then IP.4 also has to be set for modifying the
priorities of serial interrupt.
16.6.2|Serial Communication Interrupt Service Routine
Although to be handled separately, both transmission and receiving interrupts are having a common vector
address for their ISR, which is 0023H. e serial communication ISR, placed at this address, should check
both TI (bit 1) and RI (bit 0) of SCON SFR to ensure which one is the source of the present interrupt and
service accordingly. If TI bit is set then the processor completed 1-byte data transmission and ...
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