Hi All,, How can i declare constant bit fields in a struct ?? struct mystruct{ unsigned char xx:6; unsigned char yy:2; }mystruct; Let us say i want mystruct.yy to be a constant 00, how can i do that ?? mystruct must be a 8-bit datatype. which of its two components xx and yy would be at MSB ?? If anyone can tell how to figure that out it would be great. Thankzz && Bye -Rocknmoon