题目内容
LCD 1602 LCD display module, can display 2 lines, each line of 16 characters.
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In the dynamic display of the digital tube, only one LED digital tube is on at any time. It is the afterglow of the LED and the "visual persistence" of the human eye that cause the "false appearance" of the digital tube display at the same time.
In order to provide the interface circuit for the 8 × 8 non coding keyboard of scanning method, two 8-bit parallel input ports and one 8-bit parallel output port are needed in the interface circuit.
When LED nixie tube works in dynamic display mode, only one nixie tube is lit at the same time.
当总效用达到最大值时，边际效用（）
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