Controller Board 7-3
3.2 Digital Architecture
MCU configuration
There is one common MCU architecture for low-tier as well as for the high-tier products. It covers
the Conventional and Trunking portables. An open architecture system with the new HC11FL0 as
the processor is used. Combinations of different size RAM, ROM and EEPROM are available for
various application software.
ModB/Vstby Supply
Under various conditions, the supply to the ModB/Vstby would vary. Table 7-1 shows these
conditions and circuits in operation.
Table 7-1 ModB/Vstby Supply Modes
Condition Circuit Operation
Radio On Vdd supply voltage via CR411
Radio Off • Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• U410 supplies 3.2V to ModB/Vstby
Primary battery removed • Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• LiO battery provides 3.2V to ModB/Vstby
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