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4 System Drivers
Provides system level core functionality, like Clock, Interrupt, Pins. Some of these can be device dependent.
4.6 MVIO - Multi-Voltage I/O

1 MCC Melody API Reference for PIC16F / PIC18F Device Families
Lists the Libraries, Drivers, PLIB Drivers and System Drivers which support PIC16F / PIC18F families of microcontrollers in MCC Melody.
2 Drivers
Drivers provide a portable functional interface to the functionalities of the peripheral. Provides an API supporting peripheral functionality.
3 PLIB Drivers
Peripheral Libraries (PLIB) may provide firmware portability, but in general provide only a non-portable interface to peripheral functionality, in the form of an API to support peripheral functionality.
4 System Drivers
Provides system level core functionality, like Clock, Interrupt, Pins. Some of these can be device dependent.
- 4.1 CLKREF - Clock Reference
- 4.2 Configuration Bits and Registers for PIC16 Devices
- 4.3 Configuration Bits and Registers for PIC18 Devices
- 4.4 CPU - Central Processing Unit
- 4.5 Interrupt Manager
- 4.6 MVIO - Multi-Voltage I/O
  - 4.6.1 MVIO
    Multi-Voltage I/O
  - 4.6.2 MVIO with I3C and I2C support
    Multi-Voltage I/O with I3C and I2C support
- 4.7 OSC - Clock Controller
- 4.8 Pin Manager
- 4.9 PMD - Peripheral Module Disable
- 4.10 WDT - Watchdog Timer
5 Revision History
A concise summary of the changes for each version of the PIC16F/PIC18F API Reference.
Microchip Information

4.6 MVIO - Multi-Voltage I/O

The MPLAB® Code Configurator (MCC) Melody Multi-Voltage I/O Peripheral Library (PLIBs) drivers generates APIs to support MVIO-specific peripheral functionality on target MCUs.

MVIO's are categorized as follows:

MVIO
MVIO with I3C and I2C support