Designer Reference Manual

Passive Infrared (PIR) Unit

16

General Description

MOTOROLA

General Description

The main purpose of this document is to demonstrate the ability of the

MC68HC908JK1/3 to program its own FLASH

memory, effectively using

this FLASH memory as a nonvolatile data store.

The PIR is analyzed first with respect to its main features, followed by

the two intruder detection algorithms. Motorola FLASH programming is

then studied, with particular reference to self programming. The

REMOTE control unit is analyzed in a manner similar to the PIR unit.

Finally, the accompanying Windows

program is analyzed.

Throughout the document, references are made to source code files

which can be found in

Appendix E. PIR Source Code Files

and

Appendix F. REMOTE Source Code Files

. For those viewing this

document in .pdf format, these files can be accessed by clicking on the

appropriate hyperlink reference. Some text areas have in-line source

code extracts to highlight a particular point.

Included in this reference design are all C source code files and circuit

schematics, and a Windows

95/98/NT program is available from both