There are four different operation modes
- power off mode
- idle mode
- active mode
- local mode
In the power off mode only the circuits needed for power up are supplied.
In the idle mode circuits are in reset, powered down and clocks are stopped as long as possible.
In the active mode all the circuits are supplied with power although some parts might be in the idle state part of the time.
The transceiver electronics consists of the Radio Module (RF + BB blocks), the Ul-module and the display module. The Ul-module is connected to the Radio Module with a connector and display module is connected to Ul-module by solder joint. BB blocks and RF blocks are interconnected with PCB wiring. The Transceiver is connected to accessories via a bottom system connector with charging and accessory control.
The BB blocks provide the MCU and DSP environments, Logic control IC, memories, audio processing and RF control hardware (RFI2). On board power supply circuitry delivers operating voltages for BB blocks. RF blocks have regulators of their own.
The general purpose microcontroller, Hitachi H8/3001, communicates with the DSP, memories and Logic control IC with an 8-bit data bus.
The RF block is designed for a handportable phone which operates in the GSM system. The purpose of the RF block is to receive and demodulate the radio frequency signal from the base station and to transmit a modulated RF signal to the base station.
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