stupid and not quick but it works
load your byte to ACC
call msb_to_lsb
result in ACC
void msb_to_lsb() /*changes all bits(lsb to msb and so on)*/
{ unsigned char x;
x=ACC;
B=0;
ACC=x;
ACC&=1;
if(ACC!=0) {B|=128;}
ACC=x;
ACC&=2;
if(ACC!=0){B|=64;}
ACC=x;
ACC&=4;
if(ACC!=0){B|=32;}
ACC=x;
ACC&=8;
if(ACC!=0){B|=16;}
ACC=x;
ACC&=16;
if(ACC!=0){B|=8;}
ACC=x;
ACC&=32;
if(ACC!=0){B|=4;}
ACC=x;
ACC&=64;
if(ACC!=0){B|=2;}
ACC=x;
ACC&=128;
if(ACC!=0){B|=1;}

ACC|=B;
}