PA21PA32PA43VDD4VSS5PXS_VREG6PA57PA68PA79PXS_RX0a10PXS_RX1a11PXS_RX2a12PXS_RX3a13PXS_RX4a14PXS_RX5a15PXS_RX6a16PXS_RX7a17PD018PD119PD220PD321PD422PD523PD624PD725PB026PA027PA128