
4.3 Engine Controller
4.3.1 Engine controller components
a) CPU (IC429)
The CPU, with a 32-bit internal bus, operates in synchronization with the 132-MHz
internal clock that is generated from a 33-MHz external clock.
The CPU is used 8-MB SDRAM (IC416) and 16-Kbit EEPROM (IC421). The CPU
performs parameter control and has the following functions.
Power supply on/off control
This function performs on/off control of the drive power (26.5 V, 5.1 V, and 3.3 V)
supplied from the power supply based on the power button push-down signal that
is input after passing through the system controller.
Timer function
This function is used for the cleaning functions.
The internal RTC (realtime clock) and lithium battery allow the timer to operate
even when the AC power supply is off for performing the cleaning function.
Part 4: Technical Reference
W6200
4-44
IC409
IC439
IC440
IC442
IC441
IC437
IC410
IC411
IC424
IC419
IC403
IC418
IC417
IC407
IC408
IC416
IC405
IC401
IC402
IC405
IC415
IC423
IC420
IC422
IC425
IC426
IC427
IC432
IC433
IC421
IC429
IC430
IC431
IC428
IC434
IC435
Figure 4-29 Engine Controller
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