题目内容

The timer T1 mode 2 is used to count. It is required to send interrupt request to CPU every 100 times. The initial values of Th1 and TL1 are().

A. 9CH
B. 20H
C. 64H
D. A0H

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The timer overflow flag of MCS-51 is.

A. Tr1 and tr0
B. IE1 and ie0
C. It1 and it0
D. TF1 and TF0

The overflow flag TF0 of timer T0 of MCS-51 single chip microcomputer, if overflow occurs when the count is full, its value is ().

A. 00H
B. FFH
C. 1
D. Count value

The overflow flag TF0 of timer T0 of MCS-51 single chip microcomputer, if the full count is after the CPU response interrupt ().

A. Reset by hardware
B. Reset by software
C. Both a and B are OK
D. Random state

The overflow flag TF1 of timer T1 of MCS-51 single chip microcomputer, if overflow occurs when the count is full, if query mode is used instead of interrupt mode, it should be ().

A. Reset by hardware
B. Reset by software
C. By software in
D. We don’t have to deal with it