题目内容

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

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

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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. ( )

When the 8051 TMOD register is set with 80H, the Timer 1 can be started by only setting TR1. ( )