FFC connector specification
FP01 and the main board are connected by a single 40-pin FFC (flexible flat cable). This page lists which pins of the UNO R4 (RA4M1) and PSoC 4 on FP01 are routed to which FFC pin, and which signal each main board receives on it. Select a board to compare it side by side with FP01.
Pin map
Colors indicate the signal type. Click a pin to jump to its row in the table below. When a board is selected below, pins that board does not use (×) are dimmed.
Pin map comparison table
The four columns on the left (FFC connector number, UNO R4, PSoC 4, FP01 pin name) are always shown. Select the boards to show on the right (multiple selection allowed). “×” marks a pin that is not connected on that board.
Pin map version FFC_Rev2 / Source — “—” means not applicable (not connected to that MCU); “-” is as in the original table.
Pin functions
The 40 pins are grouped by function. When designing your own main board, it works if it receives only the pins of the signals it uses.