Chapter 4 Principles of Operation 39
4.3 Microprocessor Board
The Microprocessor Board contains the microprocessor, memory, front
panel interface, and circuitry which monitors the AC line voltage and saves
the state of the 5600 at power down. The block diagram of the
Microprocessor Board is shown in Figure 17.
Power Failure
and Watch Dog
Failure Detection
80188 EB
Microprocessor
RAM ROM
EEPROM
Data Bus
Address Bus
Laser
Interface
Front Panel
Interface
RS 232
Interface
To Front Panel RS 232 Ports To Laser
Power Fail/Reset
Watchdog Reset
GPIB
Interface
To GPIB Port
Figure 17 - Microprocessor Board Block Diagram
4.3.1 Microprocessor
The 5600 uses a CMOS 80188EB microprocessor to control its internal
operations. The 5600 provides a fail-safe timer which generates a reset in the
event of a malfunction. A 1 Hz watchdog pulse is normally present. If for
any reason this clock pulse fails to appear it will reset the 5600.
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