PIC High operator

HerbertMunch · Aug 16, 2007

Could someone please explain what the High operator does?

many thanks

philba · Aug 16, 2007

It gives you the high byte of the assemble time evaluated expression.

HerbertMunch · Aug 17, 2007

?
Sorry I still dont understand!
When used on a table construct what would it return?

Thanks

Gayan Soyza · Aug 17, 2007

HerbertMunch said:
?
When used on a table construct what would it return?
Thanks

You mean a DATA LOOKUP table?

When a CALL instruction occurred ex: (call TABLE) it writes down the next line in the STACK memory & going to TABLE read (where the Table located at). After getting Table value & returning to the previous saved value in the stack by the use of program counter.

philba · Aug 18, 2007

HIGH isn't code that gets executed. It gives you the top byte of a constant expression.

Code:

; assume all that init code happens
movlw    HIGH foo      ; puts 4 into W

; later on in the source code
ORG 400
foo    dt  "abc"

Note that HIGH foo evaluates to a constant,

HerbertMunch · Aug 19, 2007

philba said:
HIGH isn't code that gets executed. It gives you the top byte of a constant expression.

Code:

; assume all that init code happens movlw HIGH foo ; puts 4 into W ; later on in the source code ORG 400 foo dt "abc"

Note that HIGH foo evaluates to a constant,

Many thanks mate, you put it in a way that I could understand!

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