The original factory is covert to this function. If necessary, you can refer to the software that uses the attachment. The serial port corresponding to the IO port is P16 and P17

67A04 uart\64A04 uart.uvgui.huangcong
67A04 uart\64A04 uart.uvopt
67A04 uart\64A04 uart.uvproj
67A04 uart\CmdLog_Silan8051Driver.txt
67A04 uart\inc\MCU_1309.H
67A04 uart\inc\STARTUP.A51
67A04 uart\lst\67A04 uart.m51
67A04 uart\lst\adc.lst
67A04 uart\lst\GetAdcResult.lst
67A04 uart\lst\LEDOTRON_67A04.m51
67A04 uart\lst\main.lst
67A04 uart\lst\softReset.lst
67A04 uart\lst\STARTUP.lst
67A04 uart\out\67A04 uart
67A04 uart\out\67A04 uart.build_log.htm
67A04 uart\out\67A04 uart.hex
67A04 uart\out\67A04 uart.lnp
67A04 uart\out\main.obj
67A04 uart\src\main.c
67A04 uart\inc
67A04 uart\lst
67A04 uart\out
67A04 uart\src
67A04 uart

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