STC51 Series MCU through serial vk3x series chip to expand the source, including SPI, IIC, 8bit, UART mode, the reference value. Hardware costs much lower than the 16C554 family of chips. The actual verification through!

vk3x_STC51
..........\iic
..........\...\code
..........\...\....\def.bak
..........\...\....\def.h
..........\...\....\iic.c
..........\...\....\main.bak
..........\...\....\main.c
..........\...\....\STC51REG.bak
..........\...\....\stc51reg.h
..........\...\....\vk33.c
..........\...\....\vk33.h
..........\...\iic.lst
..........\...\iic.obj
..........\...\main.lst
..........\...\main.obj
..........\...\vk33.lst
..........\...\vk33.obj
..........\...\VK33XXIIC
..........\...\VK33XXIIC.hex
..........\...\VK33XXIIC.M51
..........\...\VK33XXIIC.Opt
..........\...\VK33XXIIC.plg
..........\...\VK33XXIIC.Uv2
..........\...\VK33XXIIC_Opt.Bak
..........\...\VK33XXIIC_Uv2.Bak
..........\par
..........\...\code
..........\...\....\DEF.bak
..........\...\....\def.h
..........\...\....\main.bak
..........\...\....\main.c
..........\...\....\par.bak
..........\...\....\par.c
..........\...\....\STC51REG.bak
..........\...\....\stc51reg.h
..........\...\....\vk33.c
..........\...\....\vk33.h
..........\...\main.lst
..........\...\main.obj
..........\...\par.lst
..........\...\par.obj
..........\...\vk33.lst
..........\...\vk33.obj
..........\...\VK33XXPAR
..........\...\VK33XXPAR.hex
..........\...\VK33XXPAR.M51
..........\...\VK33XXPAR.Opt
..........\...\VK33XXPAR.plg
..........\...\VK33XXPAR.Uv2
..........\...\VK33XXPAR_Opt.Bak
..........\...\VK33XXPAR_Uv2.Bak
..........\spi
..........\...\code
..........\...\....\def.bak
..........\...\....\def.h
..........\...\....\main.bak
..........\...\....\main.c
..........\...\....\spi.bak
..........\...\....\spi.c
..........\...\....\STC51REG.bak
..........\...\....\stc51reg.h
..........\...\....\vk33.c
..........\...\....\vk33.h
..........\...\main.lst
..........\...\main.obj
..........\...\spi.lst
..........\...\spi.obj
..........\...\vk33.lst
..........\...\vk33.obj
..........\...\VK33XXSPI
..........\...\VK33XXSPI.hex
..........\...\VK33XXSPI.LIB
..........\...\VK33XXSPI.M51
..........\...\VK33XXSPI.Opt
..........\...\VK33XXSPI.plg
..........\...\VK33XXSPI.Uv2
..........\...\VK33XXSPI_Opt.Bak
..........\...\VK33XXSPI_Uv2.Bak
..........\uart
..........\....\CODE
..........\....\....\DEF.bak
..........\....\....\def.h
..........\....\....\main.bak
..........\....\....\main.c
..........\....\....\stc51reg.h
..........\....\....\uart.bak
..........\....\....\uart.c
..........\....\....\vk33.c
..........\....\....\vk33.h
..........\....\main.lst
..........\....\main.obj
..........\....\uart.lst
..........\....\uart.obj
..........\....\vk33.lst
..........\....\vk33.obj
..........\....\VK33XXUART
..........\....\VK33XXUART.hex
..........\....\VK33XXUART.M51
..........\....\VK33XXUART.Opt

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