The circuit is shown in the figure. Through debugging, it is found that the circuit can neither receive nor send data. However, after short-circuiting GND and GND1, it can send and receive normally. W...
There are many kinds of serial port screens on the market now, and the main control chips have been polished. I would like to ask which microcontroller is suitable as the main control of the serial po...
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GPIO; see MCU Principle Interface: Hardware Diagram on page 243 by Hu Hancai
The 4 I/O ports of MCS-51 have three operation modes: output data mode, read port data mode,
Read port pin data mode.
In th...