Motorola GM1200E

Introduction/Theory of Operation 2.1-i
Chapter 2.1
Introduction/Theory of Operation
Table of Contents
Table of Contents
Paragraph Page
1.0 Overview ..................................................................................................... 1
2.0 Exploded View Diagram ............................................................................ 2
3.0 Theory of Operation .................................................................................. 2
3.1 General........................................................................................................ 2
3.2 Power Supplies............................................................................................ 3
3.3 Voltage Regulator Circuit............................................................................. 3
3.4 Power On / Off............................................................................................. 3
3.5 Microprocessor Circuit................................................................................. 4
3.6 Serial Peripheral Interface (SPI).................................................................. 4
3.7 Keypad Keys................................................................................................ 5
3.8 Status LED and Back Light Circuit............................................................... 5
3.9 Liquid Crystal Display (LCD)........................................................................ 5
3.10 Microphone Connector ................................................................................ 6
3.11 Electrostatic Transient Protection................................................................ 6