for GPIO. • Pins A4, A7, and all pins on the B port can be used for analog to digital input. • Pins A5, A6, B5, and B6 support pulse-width modulation. • Pins A0, A1, B0, and B1 support I2C serial communication. • UART is available on both A5 and B5 (TX) and A6 and B6 (RX). • Pin B7 supports digital-to-analog conversion.