PA0  1---|_|---20  PB0  VCC
            PA1  2         19  PB1
            PA2  3         18  PB2
       VCC  PA3  4         17  PB3  GND
       VCC  PA4  5         16  PB4  GND
       GND  PA5  6         15  PB5
       GND  PA6  7         14  PB6
       GND  PA7  8         13  PB7
            PC2  9         12  PC0
            GND 10_________11  PC1

       Port C
             $de00                     $df00
             0 (out)                   0 (in)
             1 (out)                   1 (in)
             2 (out)                   2 (in)
             3 LED                     3 (in)
             4 VCC Pin 4               4 VCC Pin 20
             5 VCC Pin 5               5 PIN 6 GND
             6 GND Pin 17              6 PIN 7 GND
             7 GND Pin 16              7 PIN 8 GND