Not my cup of tea, but: does the following partial explaination help?
The MSB leftmost nibble 0xF in 0xF3 indeed does not seem to comply with the first rule. (But again: not my cup of tea.)
Not my cup of tea, but: does the following partial explaination help?
The MSB leftmost nibble 0xF in 0xF3 indeed does not seem to comply with the first rule. (But again: not my cup of tea.)