3.1 Basic Connection Requirements

Getting started with the PIC18F27/47Q10 family of 8-bit microcontrollers requires attention to a minimal set of device pin connections before proceeding with development.

The following pins must always be connected:

• All V_DD and V_SS pins (see 3.2 Power Supply Pins)
• All V_DD pins must have a 0.1 uF bypass capacitor to V_SS.

These pins must also be connected if they are being used in the end application:

• ICSPCLK/ICSPDAT pins used for In-Circuit Serial Programming™ (ICSP™) and debugging purposes (see 3.4 In-Circuit Serial Programming™ (ICSP™) Pins)
• OSCI and OSCO pins when an external oscillator source is used (see 3.5 External Oscillator Pins)
• MCLR pin (see 3.3 Master Clear (MCLR) Pin) when external master clear configuration is selected.

Additionally, the following pins may be required:

• V_REF+/V_REF- pins are used when external voltage reference for analog modules is implemented

The minimum mandatory connections are shown in the figure below.