Most instructions are single cycle execution, with one delay cycle on branches and skips. All RAM locations function as registers as both source and destination of math and other functions. A hardware stack for storing return addresses. Data space mapped CPU, port, and peripheral registers. The program counter is also mapped into the data space and writable. There is no distinction between memory space and register space because the RAM serves the job of both memory and registers, and it is usually just referred to as the register file.
There isn't a lot Lisa has developed a range of style consultations for her clients and is proud all of her consultations are bespoke to each one of you.
These will give you a starting point to better understand your personal style.