说明：  虚拟I2C总线汇编程序软件包 I2C 软件包的底层子程序，使用前要定义好SCL和SDA。在标准80C51模式（12 Clock）下,对主频要求是不高于12MHz(1个机器周期1us)若Fosc>12MHz,则要增加相应的NOP指令数。在使用本软件包时，请在你的程序的未尾加入$INCLUDE (VI2C_ASM.ASM)即可。
(Virtual I2C-bus assembler package I2C Subroutine the bottom of the package, use the former to the definition of good SCL and SDA. 80C51 in standard mode (12 Clock), the requirements of the frequency is not higher than 12MHz (1 machine cycle 1us) if Fosc> 12MHz, would increase the number of NOP instructions. In the use of this package, please in your procedure is not the end of adding $ INCLUDE (VI2C_ASM.ASM) can.)