Control of the Washer Module
12-12 DSX™ System Service Manual
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12.5.2 Components of the Washer Module Electronics
The following components provide the control of the washer:
MICROPROCESSOR –
Overall operation of the module is based on the Hitachi H8/3337F single-chip
microcomputer. This microcomputer provides 60Kbytes of Flash ROM and 2Kbytes of
RAM. The XTAL operating frequency is 16 MHz.
The H8/3337F has the following internal peripheral capabilities:
[2] 9 ports, providing 58 I/O and 8 Input lines
Two 8-bit timers (TMR0, TMR1)
One 16-bit free-running counter (FRC)
Two digital to analog channels (DA0, DA1), with 8-bit resolution
Eight analog to digital channels (AN0 through AN7), with 10-bit resolution
Two serial communications channels (COM0, COM1)
Two pulse width modulation channels (PWM0, PWM1)
ANALOG/DIGITAL CONVERTER
The analog to digital converter is used to check the state of the waste switch (basically a
digital signal), to sense the current through the four dispense current and to check the state
of the vacuum switch (a digital signal).
SERIAL COMMUNICATION
Is used to communicate with the controlling computer system. Commands and test data
are transferred between the H8 and the external PC controller via a serial RS-232
interface. Interface drivers and receivers are used between the COM1 serial
communications channel on the H8 and the interface connector to provide proper RS-232
signal levels to the controller.
BIT PATTERN GENERATOR AND MOTOR SELECTOR
This is a MACH211 device, which is programmed to:
Produce the bit patterns required for quarter stepping for each of the three motors.
Enable the Y or the Z motor to be driven independently or simultaneously with the X
motor.
Enable Y and Z motors to be driven simultaneously but independently only in
direction
Enable the X motor to be driven independently of the other two
Each motor requires Direction and Reset. The X motor has its own dedicated clock while
the Y and Z each share the SHARED CLOCK.
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