题目内容

In SCM application system, LED digital tube display circuit usually has () display mode.

A. Static
B. News
C. Static and dynamic
D. Inquiry

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The segment code of the character "6" is () when the common anode LED digital tube is driven by reverser.

A. 06H
B. 7DH
C. 82H
D. FAH

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If LED digital tube adopts dynamic display mode, the following statement is wrong.

A. Connect the segments of the digital tubes in parallel
B. The segment selection is controlled by an 8-bit I / O port
Connect the common end of each digital tube directly to + 5V or GND
D. The bit selection of each digital tube is controlled by its own independent I / O port

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The structure of the key switch is usually a mechanical elastic element. When the key is pressed and opened, the contact will be unstable at the moment of closing and opening. In order to eliminate the adverse consequences caused by jitter, the methods often used are () .

A. Hardware de-bouncing(去抖动)
B. Software de-bouncing
C. , hardware and software two methods
D. Mono-stable circuit(单稳态电路) de-bouncing method

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The segment code of the character "6" is () when the common anode LED digital tube is driven by inverter.

A. 06H
B. 7DH
C. 82H
D. FAH

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In SCM application system, LED digital tube display circuit usually has () display mode.

A. Static B. News C. Static and dynamic D. Inquiry

The segment code of the character "6" is () when the common anode LED digital tube is driven by reverser.

If LED digital tube adopts dynamic display mode, the following statement is wrong.

The structure of the key switch is usually a mechanical elastic element. When the key is pressed and opened, the contact will be unstable at the moment of closing and opening. In order to eliminate the adverse consequences caused by jitter, the methods often used are () .

The segment code of the character "6" is () when the common anode LED digital tube is driven by inverter.

A. Static
B. News
C. Static and dynamic
D. Inquiry