HYT TC-700 Service Manual page 15

Control System
The IC500 CPU operates at 9.8304 MHz.
The block diagram of MCU control system is shown as following：
Circuit in this section is mainly comprised of MCU, EEPROM etc.
MCU control circuit accomplishes the following functions: accomplish the reset initialization according
to the programmed feature of the radio when power on; detect keying signal and monitor battery
voltage; send necessary frequency data to PLL according to encode of the channel; switch and control
transmit/receive according to the signal input from PTT key; turn on/off the mute circuit according to
the input signaling decode signal and squelch level signal; output control signal to control the light/off
of LED; control signaling process IC to perform tasks.
EEPROM
Fig.6 MCU Block Diagram
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TC-700 Service Manual