Take a look at the Intel 8052 Microcontroller. It has a part of its internal RAM that can be addressed as bytes with normal instructions, but also has special b

Take a look at the Intel 8052 Microcontroller. It has a part of its internal RAM that can be addressed as bytes with normal instructions, but also has special bit-instructions. You could set and clear a bit and jump if is was set or not set. I used this feature a lot when making a little tetris game for the processor, but it was not essential.