It's a long read (800 pages, but it feels longer), but it is sufficiently clear, unless you're really tech illiterate (if you're interested in this you probably aren't).
It starts pretty dry, when it tells you about the logical structures (AND, OR, NOR gates, etc.) you can make with transistors, those structures being used as the buildings blocks for bigger features of a processors. Then it goes into instruction sets, this is a really enlightening part, assembly languages, etc.
If you're not in any rush and don't hesitate to google things here and there, you'll get through it. There are parts that can be skipped too, like all the stuff about history of computers, the intel vs AMD saga, etc. For example, it mentions a time, long ago, when there was this central system that never caught on, meant to be used by users connecting to it, kinda like the idea of cloud computing but 40 years ago.