I need to know about what a lookup table exactly is. I'm studying the 8051 uC, I am following the book "The 8051 Microcontroller, by I. Scott MacKenzie". There's nothing much mentioned about lookup tables, only a tiny one-paragraph section. It's not clear to me what a lookup table is and why is it required.
Basically I need to know the following: •what a lookup table is •how to create a lookup table •accessing a lookup table •how is it stored in memory
Help would be much appreciated. Thank you :)
A lookup table is a general software/hardware concept, so a book about a specific processor or a specific programming language doesn't have much reason to describe the concept.
A lookup table is a one-dimensional or multi-dimensional array/vector where you use one or more index/indices into the table to lookup a new value.
So you might take the ID of an article as index and lookup the price of the article. Or a board game might have different pieces, where the lookup table contains the name - or position - of the individual pieces. Or the x,y position might be used to lookup if a piece is already at that location.
ab example from my wlork last week
I read a thermistlor which is very non-linear
I have a table{100][2] which hen contain R@100 R@99 R@98 ...
then I start with table[index] and go up or down till I have > and <, then 'index' will be the hemp
Erik,
I do wish you'd consider using some of your undoubted huge income to invest in a new keyboard. It would make your useful posts far more readable.