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. An ideal situation for implementing this application would be in creating a "super password" for general, access-control secure logins when transmitting information onto the internet (i.e., through a browser) or a Java applet.