If you mean that you want an i2c bit banging routine then amazingly there are examples on this very webpage http://www.smartdata.com.au/8051/defa...fortunatly we are not allowed anymore to suggest to people that they use google to look for stuff on the internet so i cannot tell you how i found it .If you mean you want spi then there are not any code examples because its very simple to do and can be very simply written as a bit banging routine.
Obviously as the i2c interface specifies what are acceptable limits for the timing of the signals then a routine written for a 12 cycle clock might not work for a 1 cycle clock.