A.P0SEL∣=0x4C;B.P0SEL∣=~0x4C;C.P0SEL &=0x4C;D.P0SEL &=~0x4C;
A.P0SEL &=~0x42;B.P0SEL &=~0x24;C.P0SEL∣=0x42;D.P0SEL∣=0x24;