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[8] FLASH ROM (XU601)
1 Mbyte boot ROM used to initialize the
CPU at power ON. Stores the
downloaded program.
[9] FLASH ROM (U612, U618)
1 Mbyte ROMs used to store the program
for the image controller. The following
functions are also provided.
• Interface analysis
• Operation panel control
• Generation of test pattern
[10] EEPROM (U619)
32Kbyte ROM used to store information
on the printer and the values set using the
operation panel.
[11] PIO (U634)
Intermediary between the CPU (U607)
and operation panel input/output port.
[12] CPU (U607)
Uses the external 33 MHz clock.
Major functions are as follows.
• Controls the image controller
• Vector raster conversion
• Raster/raster conversion
• Controls communication with the
engine controller
[13] Reset IC (U613)
Resets the CPU (U607) at power ON.
CHAPTER 2. BASIC OPERATION
[14]Timer (U609)
Uses the external clock of 14.7MHz
divided by 2.
Functions as a timer for :
• DRAM refresh timing
• Communication with the engine
controller
• System operation of the image
controller
2–9
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