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INTRODUCTION

The purpose of this application note is to demonstrate how KEELOQ? code hopping technology can be conveniently employed to implement an automatic code hopping password generator/keypad.

Using a PIC12C508, the hopping code produced by an HCS300 is converted to a string of 16 hex digits. This string is then transferred to the PC via the keyboard line, thereby emulating the actual pressure of a sequence of keys on a standard PC/AT? keyboard. Since this conversion process is transparent to any application, it appears as if the user is simply typing on a PC/AT-type keyboard.