Common skills in embedded programming

Suppose a 8 Bit register , Bit addressing is not possible directly , Other bits that are not affected by word assignment . Then give a certain position 0, Set up 1, Common writing of negation .

Let's take the fourth digit as an example (reg Is the octet register )：

Will be the first 4 Location 0：reg &= ~(1<<4);

Will be the first 4 Location 1：reg |= (1<<4);

Will be the first 4 Bit inversion ：reg ^= (1<<4);