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[Acetronics2]

Hi, Yasser

From reading your posts, I understand you want to scan your EEPROM, increasing address way, on a PORTB.4 H to L transition and decreasing addresses on a L to H transition ...

Ok ...

just use a FOR - NEXT EEPROM reading loop in the main program , if a "H2L" flag is set and a FOR-NEXT-STEP-1 EEPROM loop if a "L2H" flag is set.

Note I use 2 flags to let the initial "no transition" condition usable for something Else...

The ONLY questions will be : do you want to toggle reading order if EEPROM reading is not complete ???
What will you do when EEPROM reading is complete ??? ( seems you wait for further transition ... )

This has a strange smell of "K2000 scanner" or scrolling device ... really don't know why ... LOL !

Alain

[yasser hassani]

Thanks dear Acetronics. OK. I should explain more about my problem. Suppose that I want to read EEPROM from 0000h-05DCh. Variable Add refers to address of place that should be read and displayed on LCD. When L2H interrupt occures, program starts displaying Add on LCD. Add increments one by one. If H2L interrupt doesn't occure Add rolles over and initialize with 0000. When H2L interrupt occures program should start displaing Add and decrement it one by one. For example if Add=100 and H2L occures, program starts displaying from 100 and decrement it. Suppose that Add reaches to 0000 and L2H interrupt doesn't occure. In this case program should initialize Add with 05DCh and decrement it one by one.
Thanks again for your attention. I wait for your suggestions.
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Regards