Increment a Byte

[aratti]

If pwr >= 255 always go to 0 and no to 255.Why happen this?

Since a byte can count up to 255 max when you add 1 to 255 the byte overflow and start from zero again (it cannot be 256).

If you want to keep your variable pwr at 255 then you can skip the add command, or you must use a word variable.

pwr var byte

If up = 1 Then
       PAUSE 50
    If pwr = 255 Then Skip00
 pwr = pwr + 1                              
 Skip00:                       
Endif

Al.