Chapter 3 Principles of Operation 33
3.4 Microprocessor Board
The Microprocessor Board contains the microprocessor, memory, the serial interface
to the TEC and Laser Modules, front panel interface, and circuitry which monitors
the AC line voltage and saves the state of the 6000 at power down. The block
diagram of the Microprocessor Board is shown in Figure 19.
Power Failure
and Watch Dog
Failure Detection
80188 EB
Microprocessor
RAM ROM
EEPROM
Data Bus
Address Bus
Module
Interface
Front Panel
Interface
GPIB
Interface
RS 232
Interface
To GPIB Port
To Front Panel RS 232 Ports To Modules
Power Fail/Reset
Watchdog Reset
Figure 19 - Microprocessor Board Block Diagram
3.4.1 Microprocessor
The 6000 uses a CMOS 80188EB microprocessor to control its internal operations.
The 6000 provides a fail-safe timer which generates a reset in the event of a
malfunction. A 1 Hz watch-dog pulse is normally present. If for any reason this
clock pulse fails to appear it will reset the 6000.
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