If bit 6 is the write strobe, surely the ascii characters need some manipulation eg: ascii 'A' = 0x41, so a lookup table or other method would need to be used. I'd need more information in order to give a more concise answer.


As for the term 'parsing' - I don't think that is correct in this context. The compiler 'parses' the for loop in order to decompose its structure, you want to find out how to arrange the code to do what you want. Anyway, for variable length strings a while loop would probably be a better choice.

void print_msg(char *msg)
{
    while(*msg)
       {
       P0 = *msg;
       ...do whatever
       msg++;
       }
}
'c' appends a null character '\0' or 0x00 onto the ends of strings, so the statement 'while (*msg)' translates into "while the current character value is not equal to zero, do"