Min, max

chick

I have been working on a program that needs to use the instruction MIN. But it doesn't seem to work.

N is a var (8 bit) from 0-255. At one piont in the program I need to lower n from its midpiont of 128 in increments of 40.

The line is written: n=n-40 min 3
Yet what happens is that n goes from 128 to 88 to 48 to 8, then instead of stopping at 3 it jumps to 255 and keeps subtracting. 8 gets it to 0 or 255 and subtrackt the remaining 32 and ends up at 223 and then 183, etc.

Any thoughts on the fix.

Thanks in advance.

Lou

Paul Baker

MIN doesn't work the way you expect because it provides a floor to positive values, this means the result to be compared may not be a negative number, something which is violated when you perform 8-40. There are many ways of computing what you want, one way is to do:

n=n-40
IF n > 128 THEN n=3

This catches the situation when a negative occurs and forces it to the value 3.

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·1+1=10

chick

Paul,

Many thanks, that solved the problem.

Lou