... for higher driving capacity than 8255 Main Features72 TTL digital I/O lines Emulates mode 0 of 8255 PPI Buffered circuits for ... match” and “Change of state” interrupt functions for critical I/O monitoring Keeps I/O setting and digital output values when hot system reset ... -bit I/O ports: A0, B0, C0, A1, B1, C1, A2, B2, C2, A3, B3 and C3. Users can configure each port as ...