The Microchip PIC18F1320-I/P is an 8-bit PIC MCU running at 40 MHz with 8 KB of Flash program memory, 256 bytes of RAM, and 256 bytes of EEPROM. It integrates a 7-channel 10-bit ADC, a UART, and peripherals including Brown-out Detect/Reset, LVD, POR, PWM, and WDT.
Memory budget and peripheral fit
The 8 KB Flash (4K x 16) is sized for firmware that fits in a few thousand instructions — think state machines, PID loops, or Modbus polling. The 256-byte EEPROM block is separate from program memory, so configuration parameters or calibration constants survive a firmware update without external storage. The 256-byte RAM is tight; any substantial data buffer (e.g., a UART FIFO) will need careful budgeting. The internal oscillator trims the BOM by one external crystal, though the 40 MHz core speed may require an external clock for precise timing in UART baud-rate generation.
The internal POR and BOR peripherals handle power-up sequencing and brown-out recovery without an external supervisor IC.
ROHS3 compliant.