All the PIC16F15244 I/O pins are accessible at the edge connectors on the board. The image below shows the board pinout.
Figure 1. PIC16F15244 Curiosity Nano Pinout
Info: Peripheral signals shown in the image
above, such as UART, I2C, SPI, ADC, PWM, and others, are shown at specific
pins to comply with the Curiosity Nano Board standard. These signals can usually be
routed to alternate pins using the Peripheral Pin Select (PPS) feature in the PIC16F15244.