according to this figure, this is one word per 8-bit character:
So
 :data dat 0x170, "Hello ", 0x2e1 ... 
will generate
 0x0170 0x0048 0x0065 0x006c 0x006c 0x006f 0x0020 0x02e1 
and etc.
it checks the difference between ordinary characters and special characters with
 ifg a, 0xff 
this will lead to the conclusion that all ascii char will have their own word