题目内容
The seven segment Common cathode LED displays the character "H", and the segment code should be ()
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When. P0 port is used as bus port, it is a bidirectional port.
The font code of LED digital tube is fixed.
When. P0 port is used as general I / O port, the external pin must be connected with pull-up resistor, so it is a quasi -bidirectional port.
When P1-P3 ports are used as input ports, 1 must be written to the port register first.
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