A hands-on guide to GPIO programming on the Microchip PIC18F47Q10 8-bit microcontroller. Covers the port architecture, all eight Special Function Registers (SFRs) per port including TRIS, LAT, PORT, ANSEL, WPU, INLVL, SLRCON, and ODCON, and explains when to use LAT vs PORT for output operations. Walks through breadboarding four LEDs on Port A, setting up an MPLAB X project with MCC, and writing C code to initialize GPIO registers using bitmask read-modify-write techniques. Concludes with a simple LED blinking loop using XOR toggling on the LATA register, and discusses defensive programming practices for register manipulation.
