题目内容
The P2 port of 8051 can be used for general I/O or as the high byte of the address bus for access external memory with MOVX instruction. ( )
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How many address signals are generated by 8051 to access external data memory by instruction MOVX @R0, A? ()
Memory address ______ H in the interrupt vector table is assigned to serial port, and the memory address ______ H is assigned to external interrupt 0.
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When 8051 serial port operates in Mode 2, to transmit the ninth bit, it should store into ().
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