Motorola GM1200E Service Manual page 27

Paragraph
1.0 Introduction ................................................................................................ 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 (
2.10 SPEB Serial Interface .................................................................................. 5
2.11 General Purpose Input/Output..................................................................... 6
2.12 Normal Microprocessor Operation............................................................... 6
2.13 FLASH Electronically Erasable Programmable Memory (
2.14 Electrically Erasable Programmable Memory (
2.15 Static Random Access Memory (
3.0 General ....................................................................................................... 9
3.1 Audio Signalling Filter IC (
3.2 Audio Ground............................................................................................... 9
4.0 Transmit Audio Circuits ........................................................................... 10
4.1 Mic Input Path............................................................................................ 10
4.2 External Mic Path....................................................................................... 11
4.3 PTT Sensing and TX Audio Processing .................................................... 11
4.4 TX Secure Audio (optional)........................................................................ 11
Introduction/Theory of Operation
Chapter 3.1
Introduction/Theory of Operation
Table of Contents
Controller Audio and Signalling Circuits
) ................................................................... 4
SPI
)....................................................... 9
SRAM
) ................................................................. 9
ASFIC
Table of Contents
FLASH EEPROM
) ............................. 8
EEPROM
Page
) .. 8
3.1-i