C51串口扩展5个源代码，可以弥补51单片机串口不足的缺点，-C51 Serial Port Expansion five source code, it could make up for 51 microcontroller serial shortage of shortcomings,

这个SP2358外扩串口芯片的C语言源程序。非好好用。-Extend outside the SP2358 chip serial C language source code. Non-properly used.

^a 01h: sp01 F1 ^b 02h: sp02 F1 ^c 03h: sp03 F3 ^d 04h: sp04 F4 ^e 05h: sp05 F5 ^f 06h: sp06 F6 ^g 07h: sp07 F7 ^h 08h: sp16 BACKSPACE (directly accepted in VT) ^i 09h: sp35 TAB (accepted too)