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Two options:
1. Search this forum for "8051 AND keyboard"
2. See application note AN434 from Philips: www.semiconductors.philips.com/acrobat/applicationnotes/AN434.pdf
All what you need to do here is to remove part of code for I2C interface.
This one even includes Look-up Tables for translation from keboard codes to ASCII.
If you pull the Proteus Demo Version (h**p://www.labcenter.co.uk) and look at the 8051 Calculator sample the program contains keyscanning/debouncing routines in 8051 assembler.
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