Lecture 05 pic io port programming
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The document covers I/O port programming for the PIC18F458 microcontroller, detailing the alternative functions of ports including ADC, timers, and serial communication. It explains the significance of the TRIS register for designating ports as inputs or outputs and describes methods of data transfer between ports. Additionally, it addresses the concept of bit addressability for managing port operations.
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Lecture 05 pic io port programming
- 1. I/O port programming (PIC)
- 2. PIC 18 – I/O ports
- 3. PIC18F458 Alternative functions of Ports • ADC • Timers • Interrupts • Serial communication
- 4. PORT SFRs • Each port has three (3) SFRs associated with it. • PORTx • TRISx (TRIState) • LATx (LATch)
- 5. TRIS register role • This makes a given port an input or output port. • Output write 0s to TRISx (0 stands for Out) • Input write 1s to TRISx (1 stands for In) • Unless we activate TRISx bits (set to 0s), the data will not go from port register to the pins of PIC. • Ex:
- 6. TRIS register role • Get data from PORTC and send it to PORTB
- 7. Different ways to do same things
- 8. Read followed by write I/O operation Alternative Method
- 9. Ports status upon reset
- 10. Bit addressability • Single-Bit (Bit oriented) instruction
- 15. Summary