RXD3AD0/P0.01TXD3AD1/P0.12AD3/P0.23AD4/P0.34P0.45P0.56P0.67P0.78RxD2/ADC0/P1.09TxD2/ADC1/P1.110P1.211P1.312P1.413P1.514P1.6/XTAL215P1.7XTAL116P5.417Vcc18P5.519GND20P3.0/RxD21P3.1/TxD22P3.223P3.324P3.425P3.526P3.627P3.728P4.129P4.230P4.431P2.032P2.133P2.234P2.335P2.436P2.537P2.638P2.739P4.540