Sample code for most PIC18F4520 operations

Digital input and output bit-by-bit or byte-by-byte

Reading up to twelve Analog Inputs

Counting pulses with Timer0

Counting pulses with Timer1

PWM outputs for torque control of one or two DC motors; Timer 2

Serial RS232 communication between PIC and a text window

Periodic servo cycles using interrupt routines, 10mS & slower; Timer 0

Periodic servo cycles using interrupt routines; 10mS & faster; Timer 2

Interrupts generated by an external pulse

PWM output in software for position control of up to five RC servos; Timer 3

PWM output in hardware for position control of up to two RC servos; Timer 2

Quadrature decoder/counter in software for arbitarily many encoders; 1KHz max

Quadrature decoder/counter in hardware for one fast encoder; Timers 0 and 1

Analog output using 8 digital lines

Analog output using I2C serial