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AN662

Using KEELOQ® to Generate Hopping Passwords

Microchip Technology 

AN665

Please check the Microchip Worldwide Web at www.microchip.com for the latest version of the source code.

APPENDIX A: HOPPASW.LST

MPASM 01.40 Released

HOPPASW.ASM 2-20-1997 16:45:24

PAGE 1

LOC OBJECT CODE

VALUE

LINE SOURCE TEXT

00001

LIST

n=0, c=132

00002

PROCESSOR PIC12C508

00003

RADIX

HEX

00004

00005 ;* filename: HOPPASW.ASM

00006 ;**********************************************************************

00007 ;*

Author:

Lucio Di Jasio

00008 ;*

Company:

Microchip Technology

00009 ;*

Revision:

RevA0

00010 ;*

Date:

4-sept-96

00011 ;*

Assembled using: MPASM rev. 1.40

00012 ;**********************************************************************

00013 ;*

include files:

00014 ;*

p12C508.inc

00015 ;*

00016 ;**********************************************************************

00017 ;*

HCS300 to keyboard interface, for hopping password generation

00018 ;*

00019 ;*

/

/

00020 ;*

HCS300 |5V

|5V

00021 ;*

+-------+ |

| +--------+

00022 ;* Key1-+S1

+-+

+-+Vdd

+-----GND

00023 ;* Key2-+S2 LED+---------------------+LED

+-----PCCLK

00024 ;* Key3-+S3 PWM+---------------------+HCSIN +-----DATA

00025 ;* Key4-+S4

+-+

-+nc

+-----SWITCH

00026 ;*

+-------+ |

+--------+

00027 ;*

|

00028 ;*

VGnd

00029 ;*

00030 ;**********************************************************************

00031

00032

INCLUDE Ò\pic\include\p12c508.incÓ

00001

LIST

00002 ; P12C508.INC Standard Header File, Vers 1.01 Microchip Technology. Inc.

00103

LIST

00033

0FFF 0FEA

00034

__CONFIG _IntRC_OSC & _MCLRE_OFF & _CP_OFF & _WDT_OFF

01FF 0000 0003 0001 00035

__IDLOCS HÕ0312Õ

0002

00036

00037 ;**********************************************************************

00038 ;* internal 4MHz clock

00039 ;* internal reset

00040 ;* no code protect (?)

00041 ;* no watchdog

00042 ;* ID code is Ò0312Ó

00043 ;**********************************************************************

00044

00045 ;

00046 ; pin description

00047 ;

00048 #define LED

GPIO,5

; Led from HCS300

ã 1997 Microchip Technology Inc.

DS00665A-page 7

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