MCS3142 datasheet(28/57 Pages) MICROCHIP

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MCS3142 DUAL KEELOQ® ENCODER

WIRELESS REMOTE CONTROL

DEVELOPMENT KIT USER’S GUIDE

 2014 Microchip Technology Inc.

DS40001746A-page 27

Chapter 6. Developing with the MCS3142 Wireless Security

Remote Control Development Kit

6.1

INTRODUCTION

The software on the demo board was constructed so that a developer can easily

customize the existing code base. The entire code is written in ‘C’ and has clearly

documented sections where the developer can insert custom code.

6.2

PROGRAMMING THE MCS3142

Since the MCS3142 is a hardware encoder, its entire memory map cannot be

programmed. Only portions of the MCS3142 memory are programmable. Please see

Section 7.3.3 “Generate Source” for more information on how to generate code for

the MCS3142 via the MPLAB X KEELOQ plugin.

To modify the configuration data in the key fob, the developer needs to open the red

plastic enclosure. The ICSP™ port is available on the key fob PCB as six contact areas.

The following steps need to be followed to program the MCS3142:

• Remove the PCB board from the plastic enclosure and lay the PCB board on a

non-conductive surface.

• Align the six ICSP pins to the contact areas on the PCB. Push the ICSP pins to

the contact areas and avoid any movement during programming.

6.3

DEVELOPING WITH THE EMBEDDED SECURITY BOARD

The Embedded Security Development Board acts as a receiver in the MCS3142

Wireless Security Remote Control Development Kit. The target application

microcontroller on the right side of the development board interacts with the receiver.

All data receiving and KEELOQ security functionalities are performed by the target

application microcontroller. The host microcontroller is only used to drive the LCD

display and package data for the PC interface. The developer should only need to

develop on the target side. The prototyping area under the four push buttons for target

application controller can be used to prototype the application.

Note: Avoid touching the PCB antenna when testing.

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