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proteus Lite 6.4 sp2 - the portB go ON but don't go OFF

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acaselli

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I learning to use ISIS, so I try whit simple circuit with a 16f84 and a LED/220ohm on PORTB: when I put the bit to 1 the port go ON: after I put the bit to 0 but the port stay ON. Why?? When I go step by step, I check the value in the REGISTER and the value is right, but the value of the voltage on the pin is high forever.

Daily I work in assembler with Intel 80C196... so I think that the problem is ISIS... or not??

When I open the ISIS example "semaphore" it work well, but if I modify the circuit and add a buzzer (for example, without connection of course) and play the simulation, it run wrong: the semaphore go ON but don't go OFF.

Can someone help me?

Thank, Andrea.
 

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