Theory of Operation 4-i
Chapter 4
Theory of Operation
Table of Contents
Table of Contents
1.0 Overview
..................................................................................................... 1
2.0 Open Controller
.......................................................................................... 1
2.1 General........................................................................................................ 1
2.2 Voltage Regulators ...................................................................................... 1
2.3 Electronic On/Off ......................................................................................... 2
2.4 Emergency................................................................................................... 2
2.5 Mechanical On/Off....................................................................................... 3
2.6 Ignition ......................................................................................................... 3
2.7 Hook RSS.................................................................................................... 3
2.8 Microprocessor Clock Synthesizer .............................................................. 4
2.9 Serial Peripheral Interface (SPI).................................................................. 4
2.10 SPEB Serial Interface.................................................................................. 5
2.11 General Purpose Input/Output..................................................................... 5
2.12 Normal Microprocessor Operation............................................................... 5
2.13 FLASH Electronically Erasable Programmable Memory
(FLASH EEPROM) ...................................................................................... 7
2.14 Electrically Erasable Programmable Memory (EEPROM)........................... 7
2.15 Static Random Access Memory (SRAM)..................................................... 8
2.16 Blank Control Head...................................................................................... 8
CONTROLLER BOARD AUDIO AND SIGNALLING CIRCUITS
3.0 General
....................................................................................................... 9
3.1 Audio Signalling Filter IC (ASFIC) ............................................................... 9
3.2 Audio Ground............................................................................................... 9
4.0 Transmit Audio Circuits
............................................................................. 9
4.1 Mic Input Path.............................................................................................. 9
4.2 External Mic Path....................................................................................... 10
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