8051 series chips are usually only one or two serial ports, in engineering practice, often requires a number of serial communications for the entire system, but an ordinary single-chip DSP, or the original less than the UART serial port. GM8125 can be a standard full-duplex serial port expansion into the standard five full-duplex serial port, and can control external pin serial port expansion mode: single mode or multi-channel mode.

GM8125.pdf

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