Chapter 1: 2-6 Notes For All Schematics and Circuit Boards
6881091C63-A
FECTRL 1 Control Voltage for Front-End Filter
FECTRL 2 Control Voltage for Front-End Attenuator Switch
FLASH CS Flash Chip Select
FLASH OE Flash Output Enable
FLAT RX SND Option Board Audio Output Signal
FLAT TX RTN Flat TX Input from Option Board and Accessory
Connector
FLT A+ Filtered 13.2 V Supply Voltage
GP x IN General Purpose Input x
GP x IN ACC y General Purpose Input x from Accessory
Connector Pin y
GP x IN OUT ACC y General Purpose Input/Output x from Accessory
Connector Pin y
GP x OUT General Purpose Output x
GP x OUT ACC y General Purpose Input x from Accessory
Connector Pin y
GPIO General Purpose Input Output Lines
HANDSET AUDIO Handset Audio Output
HOOK Hang-up Switch Input
HSIO High Speed Clock In / Data Out
IF First Intermediate Frequency Signal
IGNITION CONTROL Ignition Line to switch on the Radio's Voltage
Regulators
IN 5V RF REG Supply Voltage for 5V Regulator in RF Section
INT KP COL Internal Keypad Matrix Column Signal
INT KP ROW Internal Keypad Matrix Row Signal
INT MIC Internal (from Control Head) Microphone Input
INT SWB Internal Switched 13.2V Supply Voltage
INT SWB+ Internal Switched 13.2V Supply Voltage
IRQ Interrupt Request from Control Head
K9V1 9.1V in Transmit Mode
KEYPAD ID Keypad Identification Line
LCD A0 LCD Control / Display Data Select
LCD CS LCD Chip Select
LCD DATA LCD Data Lines
LCD E RD LCD Enable Read
LCD RW WR LCD Read Write Control
LED CNTRL LED Control Lines
LED GREEN Green LED Control
LED RED Red LED Control
LED YELLOW Yellow LED Control
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