Singlechip keyboard-driven information, including the keyboard interface technology, the scanning matrix keyboard driver, the ranks of matrix inversion method keyboard driver, AT89S52 Singlechip schematics, such as the keyboard interface. Procedures detailed notes. AT89S52 Single-chip-based information system, the keyboard for 4 × 4 matrix keyboard.

4×4keys.c
4×4keys.Uv2
4×4keys2.c
4×4keys2.Uv2
89S52系统板原理图.doc
键盘接口技术.txt

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