microprocessor - Map processor to circuit diagram

I am a software developer (using high level languages like .NET,C,C++ etc) trying to understand how computers work at a lower level.

I am familar with this diagram:

I am trying to gain a high level insight into how the diagram in the link maps to a circuit diagram like this:

For example, have a look at the assembly language statement:

ADD 1,2

I am trying to understand how the processor produces '3' as the output. I realise that this question may be difficult to answer in simple terms. If it is, then a link would help, perhaps to a book.

Answer

I found my answer here. It is a high level overview of the process of adding numbers.