Controller Circuits; General - Motorola Commercial Series Service Information

Controller Circuits

3.0 Controller Circuits
3.1

General

The controller board is the central interface between the various subsystems of the radio. It provides
the following functions:
interface with controls and indicators
serial bus control of major radio circuit blocks
encoding and/or decoding of selective signaling formats such as PL, DPL, MDC1200 and
QuikCall II
interface to CPS programming via the microphone connector
storage of customer-specific information such as channel frequencies, scan lists, and
signaling codes
storage of factory tuning parameters such as transmitter power and deviation, receiver
squelch sensitivity, and audio level adjustments
power-up, power-down and reset routines
In the UHF and VHF sections, the Radio Block Interconnect Diagram show the interconnections
between the controller and the various other radio blocks, while the Controller Interconnect
Schematic diagram (in this chapter) shows the connections between the following circuit areas
which comprise the controller block:
microprocessor circuitry
audio circuitry
DC regulation circuitry
rotary and pushbutton controls and switches
The majority of the circuitry described below is contained in the Microprocessor Circuit schematic
diagrams. However, portions are also found in the DC Regulation and UHF/VHF Audio Circuit
schematics.
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