Most of these files contain a small driving program and utility-specific subroutines to access the HC11 capabilities. The intent is to present generic subroutines which you can use in your applications.

• Registers: File with the 68HC11 registers named and defined.
  • 68HC11 Registers

• Output Port: Small stand-alone programs I use for validation of a new HC11 system.
  • Binary Count on Port B
  • Binary Count on Port B with Delay
  • Binary Count on Port C
  • Binary Count on Port C with Delay
  • Cylon Count (back & forth) on Port C
  • Blink LED on BOTBoard 2

• Delay: Various delay subroutines for timing.
  • Hard-coded delay. From 11.5 uS to 196.6 mS. 5.0 mS implemented.
  • Hard-coded long delay. 22.5 uS to 12.885 S. 1.000 S implemented.

• Input Port:
• Digital value from Port E to Port B

• A/D Converter:
  • A/D to Port B
  • A/D to Terminal
  • Count on PortB with delay set from A/D
  • Drive 1 of 4 servos positioned by pots on the A/D lines.

• Servo Control:
• Initialize Servos (2 or 4)
• Drive 1 of 4 servos positioned by pots on the A/D lines.
• Reference:  Servo.html - A detailed look at driving servo motors.
• A Simple Robot Using the 68HC11 Processor
• Enhancements to the Simple 68HC11 Robots

• Stepper Motor Control:
• Sample Stepper-Motor program 1
• Sample Stepper-Motor program 2
• Reference:  Basic Stepper Motor Concepts

• LCD:
• Sample LCD program
• LCD clock
• Reference:  LCD FAQ, V4, by Christopher Burian
• Reference:  HD44780-based LCD Modules
• Reference:  How to control HD44780-based Character-LCD
• Reference:  LCD Datasheets

• RS-232 Communications:
• Initialize Terminal (CIT or VT100)
• Read & Write to Terminal (CIT or VT100)
• Simple write to Terminal
• A/D to Terminal

• DIRRS IR Sensor:
• Reference: DIRRS Article
• Writes IR distance data to LCD.
• Writes IR distance data to Port C.
• SBASIC version:  Writes IR distance data to Port C and RS-232 serial line.
• Reference: HVW Source for purchasing the DIRRS sensor.

• Expanded Memory:
• Start in Bootstrap mode, jump to $2000

• Other:
• Sample MIDI program
• Random Number Generator Article
• Random Number Code (25-bytes)

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