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BENDIX/KING
KX 165A
Rev 0, Jun/2000
15610M00.RCD
Page 4-21
4.2.5
CENTRAL PROCESSING UNIT (CPU)
The CPU controls the function of the unit and its connections can be seen in
. An exter-
nal crystal sets the clock frequency for the CPU. The CPU also communicates to a RS-232 IC
that converts the CPU levels to those that are RS-232 compatible. An electronically erasable pro-
grammable read-only-memory device (EEPROM) is used to store alignment information and other
configuration data. The flash memory is used to store the unit software and the static random ac-
cess memory (SRAM) is used to supplement CPU memory. DME I/O conditions signals from the
CPU so they can be used to channel external DME equipment. Discrete I/O pass through filter
networks and switch transistors are then routed to the CPU for control purposes. A voltage mon-
itor on the 5V controls the reset line to the microprocessor, when the voltage on the 5V line is be-
low 4.75 VDC the CPU is held in the reset state.
Summary of Contents for Bendix/King KX 165A
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