题目内容

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.

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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

8051 interrupt service routines are always terminated with the RET instruction. ( )