Section 1: 2-6 Notes For All Schematics and Circuit Boards
6881091C63-F
BWSELECT Signal to select between the Ceramic Filter Pairs
CEX Chip Enable Line
CH ACT Channel Activity Indicator Signal (Fast Squelch)
CH KP ID Control Head Keypad ID (Data) Lines
CH REQUEST Control Head Request from Control Head µP
CLK Clock Signal
CNTLVLTG PA Power Control Voltage
CNTR AUDIO Audio Lines of the Controller
COL x Keypad Matrix Column x
CSX Chip Enable Line
DATA Data Signal
DC POWER ON Electronic Switching On or Off of the Radio's
Voltage Regulators
DISCAUDIO Audio Output Signal from the Receiver IC
ECLK Clock (not used)
EE CS EEPROM Chip Select
EMERGENCY CONTROL Emergency Line to switch on the Radio's Voltage
Regulators
EXP BD REQ Service Request Line from Expansion Board
EXP1 CS Expansion Board Chip Select 1
EXP2 CS Expansion Board Chip Select 2
EXT KP COL External Keypad Matrix Column Signal
EXT KP ROW External Keypad Matrix Row Signal
EXT MIC External (from Accessory Connector) Microphone
Input
EXT SWB+ External Switched 13.2V Supply Voltage
F1200 Interrupt Line from ASFIC CMP
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
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