101 PB3 – Not used
102 PB4 – Not used
103 PB5 – Not used
104 PB6 – Not used
105 PB7 – Not used
106 VSS – Digital ground
107 RxD0 I Input of serial data
108 TxD0 O Output of serial data
109 RxD1 I Input of serial data
110 TxD1 O Output of serial data
111 SCK0 O Output of serial clock
112 SCK1 O Output of serial clock
Pin No. Pin Name I/O Function