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FINALY IT WAS AN ERROR.AFTER THE CALL MESSAGES WAS IMMEDIATELY A GOTO INSTRUCTION SO BEFORE GOTO PCLATH SHOULD BE RESETED.

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thank you for your reply

I forgot to write that I am using assembly with mplab ide. I find it very curious that adding to pclath H'07' works ok with the messages to that direction but adding h'08' not. It happened to 16f88 too and that is why I changed to 16F877A. But I have noticed ...

I have made a program 16F877A more than 1K and by handling pclath everything were ok.When I should extend more than 0X800 I have started having problem.The program has many messages for an LCD screen. I setted tables at 0X700 and 0X800 a second part.Till 0X700 by adding in pclath H'07' the call ...

Hello to everyone

First I disabled completly the LCD by the switch on the board.I realised that the problem remains by PORTA0,1 which after RB7 press was on immediately. Then after turning on the LCD I disaled the PORTB,s pull up resistors on the option register and that's it.All went as it should ...

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My last thought was that I might have a feedback from the LCD or of a part of the circuit and yes it is very possible that this is the problem .I also had made a thought to disable the PORTB's pullup resistors but I didn't done yet. Also PORTA is used bidirectional and works that way ok. I ...

Thank you anyway mrJan. LCD works fine.I didn't wrote anywhere that there is an Lcd problem.LCD is tested with regression harness with scrolling messages etc and is very accurate.Also I wrote that I have tried delay subroutine.What I wrote is that it seems like when portb changes direction as input ...

Hello Mr Jan

Thank you for your reply.I didn't wrote more because this is a matrix's fix lesson in the assembly cd and to be honest I wasn't expected that somone else would like to answer.It is written for pic 16f84 but the development board that I have is V.3 with pic16f88. All lessons till this ...

Hello

I have the assemply student version and the developer board V.3 with PIC 16F88 on it. In tutorial 32, which is an alarm system, there is a bidirectional use of portA and portB. RB7 is used as alarm's on/off switch.But when I press it (RB7) the alarm turns on all zones and the buzzer/siren ...