题目内容
When the serial communication mode 2 or mode 3 sends, the instruction sends the status of TB8 bit into the sending SBUF.
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The 9th bit data received by serial communication is sent to rb8 of SCON register for storage.
The baud rate of serial port mode 1 is variable, which is set by the overflow rate of timer / counter T1.
The baud rate of serial port mode 1 is fixed, FOSC / 32.
A timer must be used as baud rate generator when AT89S51 single chip microcomputer carries out serial communication.
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