PIC resets when logic 1 to pin RB3

[haxan]

hi.

I am using HI Tech C compiler with PIC16F877A.

i have a small program which takes input on port B and ouputs respective LEDs on PORT D.

Everything works fine except when i give logic 1 to RB3. When i give logic 1 to RB3 it resets the PIC.

on datasheet its written RB3/PGM.

I believe this pin is also used for programming the PIC. Can this cause any issue?

 

[blueroomelectronics]

What programmer do you use?

 

[Pommie]

Turn off LVP (low voltage programming) in the config and RB3 will be a normal I/O pin.

Mike.

 

[haxan]

Turn off LVP (low voltage programming) in the config and RB3 will be a normal I/O pin.

Mike.

I think that can be the issue, will try and let know

The programmer is custom made programmer + trainer. On software side, i am using WinPIC8000

 

[haxan]

Pommie can you please tell me how to disable the LVP?

 

[Pommie]

Well, in asm it is normally _LVP_OFF added to the config line. In HiTech C I have no idea.

Mike.

 

[3v0]

__config(debugdis & lvpdis & fcmdis & iesodis & boren & unprotect & mclren & pwrten & wdten & xt);

 

[haxan]

thank you 3v0

 

[blueroomelectronics]

If your programmer is an LVP only programmer you cannot turn off LVP.