In a multi-machine application system composed of a single-chip microcomputer, the serial communication of the single-chip microcomputer plays an important role. When designing a single-chip microcomputer serial communication system, the communication rate requirements of the single-chip microcomputer are different under different environmental conditions, and the setting of the communication rate between the two parties is very important. In the single-chip microcomputer communication system, a method is studied to use the internal timer of the single-chip microcomputer to achieve the communication baud rate adjustable within a wide range without adding any external devices. The experiment shows that this method is simple, feasible, operational and practical.
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