- if(regD&(1<<PD0)){letter|=(1<<7);} // letter 1 (voltage MSB)
- if(regD&(1<<PD2)){letter|=(1<<6);} // letter 2
- if(regD&(1<<PD3)){letter|=(1<<5);} // letter 3
- if(regD&(1<<PD4)){letter|=(1<<4);} // letter 4
- if(regD&(1<<PD5)){letter|=(1<<3);} // letter 5 (current MSB)
- if(regD&(1<<PD6)){letter|=(1<<2);} // letter 6
- if(regD&(1<<PD7)){letter|=(1<<1);} // letter 7
- if(regB&(1<<PB0)){letter|=(1<<0);} // letter 8
+ if(regC&(1<<PC0)){letter|=(1<<7);} // letter 1 (voltage MSB)
+ if(regC&(1<<PC3)){letter|=(1<<6);} // letter 2
+ if(regC&(1<<PC4)){letter|=(1<<5);} // letter 3
+ if(regD&(1<<PD2)){letter|=(1<<4);} // letter 4
+ if(regB&(1<<PB3)){letter|=(1<<3);} // letter 5 (current MSB)
+ if(regD&(1<<PD4)){letter|=(1<<2);} // letter 6
+ if(regD&(1<<PD3)){letter|=(1<<1);} // letter 7
+ if(regD&(1<<PD5)){letter|=(1<<0);} // letter 8