题目内容
How many address signals are generated by 8051 to access external data memory by instruction MOVX @R0, A? ()
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Memory address ______ H in the interrupt vector table is assigned to serial port, and the memory address ______ H is assigned to external interrupt 0.
To show upper case English letter 'L' on a common cathode 7-segment display, the segment code should be set with ______ H in hex form.
When 8051 serial port operates in Mode 2, to transmit the ninth bit, it should store into ().
8051 serial data transmission is initiated by ().
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