Sample code for most PIC18F4520 operations

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  • Reading Analog Inputs
  • Counting pulses with Timer0
  • Counting pulses with Timer1
  • Digital input and output bit-by-bit or byte-by-byte
  • Periodic servo cycles using interrupt routines; Timer 0; slow
  • Periodic servo cycles using interrupt routines; Timer 2; fast
  • Interrupts generated by an external pulse
  • PWM outputs for torque control of one or two DC motors; Timer 2
  • PWM output for position control of up to four RC servos; Timer 3
  • Quadrature decoder/counter in software; slow; many
  • Quadrature decoder/counter in hardware; fast; just one; Timers 0 and 1
  • Serial RS232 communication between PIC and a text window
  • Analog output using 8 digital lines
  • Analog output using I2C serial
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