Bitwise AND, OR, XOR, NOT (aka complement), shift, ...
are the ways commonly used to set, clear, or otherwise manipulate bits within a larger container.
For example, this code is forcing the first and last bit of a variable to be set to 1, using a mask and bitwise OR.
nbits = 16;
mask = uint16( sum( 2.^[0,nbits-1] ) );
n = 5;
u = uint16( randi([0,2^nbits-1],1,n) );
y = bitor(u,mask);
for i=1:n
fprintf('Input %s\n',dec2bin(u(i),nbits))
fprintf('Mask %s\n',dec2bin(mask,nbits));
fprintf('bitor output %s\n',dec2bin(y(i),nbits))
fprintf('\n')
end
So read the whole register. Perform the bitwise operations to achieve the desired change. Then write whole integer back to the whole register.
Please note the MATLAB code above is only for example of the concept. Please use Simulink Bitwise blocks, Bitset block, etc.
