Accessing On-Chip and Off-Chip Peripherals

The PIC microcontroller is designed with on-chip ADC. However, sometimes the system requires a multi-channel digitization. The processed digitized version needs to be conveyed to the analog domain by using DAC. An optocoupler is required many a times for safely driving without causing any damage to the microcontroller itself. The case studies developed in this chapter will serve all the hardware and software requirements for the process industries where the PIC will be the core processor for the algorithmic implementation. Moreover the waveform generation and the pseudo random signal generation through PIC may be used for test signal generation. Following case studies are developed in this chapter:

• 1. 3.1Using On-Chip ADC

• 2. 3.2 Interfacing ADC0809 to PIC

• 3. 3.3 Optoisolator Interfacing

• 4. 3.4 DAC Implementation Using On-Chip PWM

• 5. 3.5 Waveform Generation Using PIC

• 6. 3.6 Pseudo-Random Number Generation Through PIC

• 7. 3.7 ON-OFF Temperature Controller Using On Chip ADC

• 8. 3.8 Implementing a PID Temperature Controller Using PIC16F877