2-4
Controller
2.4
Controller
The controller board is the central interface between the various subsystems of the radio. It is
separated into MCU digital and audio/signalling functions as shown in Figure 2-3.
Figure 2-3. Controller Block Diagram
2.4.1 MCU Digital
An open architecture system, with the HC11FL0 as the processor, is used.
The digital portion of the controller consists of a micro controller and associated EEPROM, RAM, and
ROM memories. Combinations of different size RAM and ROM are available to support various
application software.
2.4.2 Audio/Signaling
The audio/signalling/filter/companding IC (ASFIC) and the audio power amplifier (Figure 2-3) form the
main components of the audio/signalling section of the controller board. Inputs include a 16.8 MHz
clock from the synthesizer, recovered audio and squelch, microprocessor, and external or internal
microphones. Outputs include a microprocessor clock (CLK), modulator output to the synthesizer, and
amplified audio signals to an internal or external speaker.
Internal/
Microphone
External
Speaker
Internal
Speaker
SCI to Side
Connector
Audio
PA
Audio/Signalling
Architecture
To Synthesizer
Mod
Out
16.8 MHz
Reference Clock
from Synthesizer
Recovered Audio
Squelch
To RF Board
SPI
Digital
Architecture
µ
P Clock
3.3V
Regulator
(Vddd)
RAM
EEPROM
ROM
HC11FL0
ASFIC_CMP
3.3V
Regulator
(Vdda)
External
Содержание PRO3150
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