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!

Packet : 67506267vk3x_stc51.rar filelist
vk3x_STC51\iic\code\def.bak
vk3x_STC51\iic\code\def.h
vk3x_STC51\iic\code\iic.c
vk3x_STC51\iic\code\main.bak
vk3x_STC51\iic\code\main.c
vk3x_STC51\iic\code\STC51REG.bak
vk3x_STC51\iic\code\stc51reg.h
vk3x_STC51\iic\code\vk33.c
vk3x_STC51\iic\code\vk33.h
vk3x_STC51\iic\iic.lst
vk3x_STC51\iic\iic.obj
vk3x_STC51\iic\main.lst
vk3x_STC51\iic\main.obj
vk3x_STC51\iic\vk33.lst
vk3x_STC51\iic\vk33.obj
vk3x_STC51\iic\VK33XXIIC
vk3x_STC51\iic\VK33XXIIC.hex
vk3x_STC51\iic\VK33XXIIC.M51
vk3x_STC51\iic\VK33XXIIC.Opt
vk3x_STC51\iic\VK33XXIIC.plg
vk3x_STC51\iic\VK33XXIIC.Uv2
vk3x_STC51\iic\VK33XXIIC_Opt.Bak
vk3x_STC51\iic\VK33XXIIC_Uv2.Bak
vk3x_STC51\par\code\DEF.bak
vk3x_STC51\par\code\def.h
vk3x_STC51\par\code\main.bak
vk3x_STC51\par\code\main.c
vk3x_STC51\par\code\par.bak
vk3x_STC51\par\code\par.c
vk3x_STC51\par\code\STC51REG.bak
vk3x_STC51\par\code\stc51reg.h
vk3x_STC51\par\code\vk33.c
vk3x_STC51\par\code\vk33.h
vk3x_STC51\par\main.lst
vk3x_STC51\par\main.obj
vk3x_STC51\par\par.lst
vk3x_STC51\par\par.obj
vk3x_STC51\par\vk33.lst
vk3x_STC51\par\vk33.obj
vk3x_STC51\par\VK33XXPAR
vk3x_STC51\par\VK33XXPAR.hex
vk3x_STC51\par\VK33XXPAR.M51
vk3x_STC51\par\VK33XXPAR.Opt
vk3x_STC51\par\VK33XXPAR.plg
vk3x_STC51\par\VK33XXPAR.Uv2
vk3x_STC51\par\VK33XXPAR_Opt.Bak
vk3x_STC51\par\VK33XXPAR_Uv2.Bak
vk3x_STC51\spi\code\def.bak
vk3x_STC51\spi\code\def.h
vk3x_STC51\spi\code\main.bak
vk3x_STC51\spi\code\main.c
vk3x_STC51\spi\code\spi.bak
vk3x_STC51\spi\code\spi.c
vk3x_STC51\spi\code\STC51REG.bak
vk3x_STC51\spi\code\stc51reg.h
vk3x_STC51\spi\code\vk33.c
vk3x_STC51\spi\code\vk33.h
vk3x_STC51\spi\main.lst
vk3x_STC51\spi\main.obj
vk3x_STC51\spi\spi.lst
vk3x_STC51\spi\spi.obj
vk3x_STC51\spi\vk33.lst
vk3x_STC51\spi\vk33.obj
vk3x_STC51\spi\VK33XXSPI
vk3x_STC51\spi\VK33XXSPI.hex
vk3x_STC51\spi\VK33XXSPI.LIB
vk3x_STC51\spi\VK33XXSPI.M51
vk3x_STC51\spi\VK33XXSPI.Opt
vk3x_STC51\spi\VK33XXSPI.plg
vk3x_STC51\spi\VK33XXSPI.Uv2
vk3x_STC51\spi\VK33XXSPI_Opt.Bak
vk3x_STC51\spi\VK33XXSPI_Uv2.Bak
vk3x_STC51\uart\CODE\DEF.bak
vk3x_STC51\uart\CODE\def.h
vk3x_STC51\uart\CODE\main.bak
vk3x_STC51\uart\CODE\main.c
vk3x_STC51\uart\CODE\stc51reg.h
vk3x_STC51\uart\CODE\uart.bak
vk3x_STC51\uart\CODE\uart.c
vk3x_STC51\uart\CODE\vk33.c
vk3x_STC51\uart\CODE\vk33.h
vk3x_STC51\uart\main.lst
vk3x_STC51\uart\main.obj
vk3x_STC51\uart\uart.lst
vk3x_STC51\uart\uart.obj
vk3x_STC51\uart\vk33.lst
vk3x_STC51\uart\vk33.obj
vk3x_STC51\uart\VK33XXUART
vk3x_STC51\uart\VK33XXUART.hex
vk3x_STC51\uart\VK33XXUART.M51
vk3x_STC51\uart\VK33XXUART.Opt
vk3x_STC51\uart\VK33XXUART.plg
vk3x_STC51\uart\VK33XXUART.Uv2
vk3x_STC51\uart\VK33XXUART_Opt.Bak
vk3x_STC51\uart\VK33XXUART_Uv2.Bak
vk3x_STC51\iic\code
vk3x_STC51\par\code
vk3x_STC51\spi\code
vk3x_STC51\uart\CODE
vk3x_STC51\iic
vk3x_STC51\par
vk3x_STC51\spi
vk3x_STC51\uart
vk3x_STC51

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