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It is impossible for 8051 to write data to receiving SBUF. ( )

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The number of interrupt vectors of 8051 is ______ .

If a relation is anti-symmetric, then this relation cannot be symmetric.( )

For 8051 edge-triggered external interrupt, once the ISR is started, the corresponding interrupt request flag is cleared to 0 automatically. ( )

The number of bytes reserved for each interrupt vector table of 8051 is ______