User guide

How to setup and operate the demo board
16-bit MCU: S12XHY256 Automotive Cluster Demo, Rev. 0
Preliminary—Subject to Change Without Notice
Freescale Semiconductor 3
Figure 2. Flow diagram with images of demo operation
Besides driving the motors and LCD, the demo incorporates some software solutions to enhance its
functionality.
• Pressing switch 9 activates a horn sound and pressing switch 8 toggles the cruise control on and off.
• The MENU switch, allows the user to scroll through the odometer, trip A meter, and trip B meter.
This is indicated clearly on the LCD and the user will notice the digits change.
• By pressing the indicator switches simultaneously, the demo will enter a hazard mode and will
shutdown operation and begin to flash and display ‘hazard’ on the LCD. Normal operation is
commenced by letting go of the switches.
• The piezoelectric speaker plays a continuous indicator relay clicking sound. Turning the
“VOLUME” potentiometer varies the amplitude of the PWM signal that is fed to the piezoelectric
speaker.
• The four motor indicators light are controlled as follows:
— MENU, switch 7, controls MPH indicator light. Pressing the MENU switch for a second will
turn off MPH indicator for 10s.
— SELECT, switch 6, controls FUEL indicator light. Pressing the SELECT switch for a second
will turn off FUEL indicator for 10s.