题目内容
The content of the 9th bit of the transmitted data is prepared in advance in the TB8 bit of the SCON register.
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When the serial communication mode 2 or mode 3 sends, the instruction sends the status of TB8 bit into the sending SBUF.
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.
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