Port 0 pin usage.
#define porta_0 0
#define pin_Rset_i2c_mux_down 6
#define pin_Rset_i2c_mux_sup 9
#define ResIn_buffer_A_down 7
#define ResIn_buffer_B_down 8
#define ResIn_buffer_A_up 10
#define ResIn_buffer_B_up 11
#define B0 0
#define B1 1
#define B2 23
#define B3 24
#define B4 25
#define B5 26
#define B6 29
#define B7 30