题目内容
The baud rate of serial port mode 1 is fixed, FOSC / 32.
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A timer must be used as baud rate generator when AT89S51 single chip microcomputer carries out serial communication.
When AT89S51 MCU communicates with each other in serial mode, the baud rate of timer mode 2 is lower than that of timer mode 1.
The transmit buffer and receive buffer of serial port have only one unit address, but they are actually two different registers.
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