题目内容
When. P0 port is used as bus port, it is a bidirectional port.
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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.
The driving ability of P0-P3 ports is the same.
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