PIC resets when logic 1 to pin RB3

haxan

New Member

• Mar 10, 2010

• #1

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

Well-Known Member

• Mar 10, 2010

• #2

What programmer do you use?

 

P

Pommie

Well-Known Member

Most Helpful Member

• Mar 11, 2010

• #3

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

Mike.

 

haxan

New Member

• Mar 11, 2010

• #4

Pommie said:

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

Mike.

Click to expand...

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

New Member

• Mar 11, 2010

• #5

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

 

P

Pommie

Well-Known Member

Most Helpful Member

• Mar 11, 2010

• #6

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

Mike.

 

3v0

Coop Build Coordinator

Forum Supporter

• Mar 11, 2010

• #7

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

 

haxan

New Member

• Mar 11, 2010

• #8

thank you 3v0

 

blueroomelectronics

Well-Known Member

• Mar 11, 2010

• #9

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