题目内容

If Timer 1 of 8051 counts in mode 2, after executing the instruction “MOV TL1, #00H”, it will generate the overflow after counting ______ numbers.

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The P2 port of 8051 can be used for general I/O or as the low byte of the address bus for access external memory with MOVX instruction.

In 8051, () interrupt has the highest natural priority.

A. External 0
B. External 1
C. Timer 0
D. Serial port

Which of the following instruction will load the value 50H into the high byte of Timer 1? ()

A. MOV TH1, #50H
B. MOV TH1, 50H
C. MOV TL1, #50H
D. MOV TL1, 50H

For ADC0809, which of the following signals indicate that converted data is ready and available? ()

A. START
B. ALE
C. OE
D. EOC

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