F886 & pgm

[MOUNTAIN747]

I am working with the 16F886 for the first time. My compiler is PBP 2.60. After an hour trying to get the blinky light program to work (never had this problem on any other PIC) I looked for Post’s that may give me a hint as to what I may be doing wrong. I came across a Post on the 16F819 (another internal clock) that said it would not work unless PGM was tied low. I’ve never had this problem with an F819 but it solved the problem on my 886. If I remove the PGM low the PIC stops operating. I tried several 16F866 and all were the same results. This means I loose RB3 as an I/O. I haven’t tried using external oscillator on the F886 because I would like to use all I/O’s on this project. I’ve never seen any comments about this 886 charictoristec on any Post. Is there something I can do to eliminate the need for the PGM to ground?

@ DEVICE INTRC_OSC_NOCLKOUT,MCLR_OFF,BOD_OFF,WDT_OFF

comments will be appreciated!

[Bruce]

Add LVP_OFF to your config settings.

[MOUNTAIN747]

Thanks for your reply Bruce.
No dice! I thought that would do it also. Once I pull the ground wire off RB3 the LED continues to blink for about five seconds then stops.

There is also another strange thing going on. PORTA.6&7 when in digital output state drivers only 2.4V unloaded then drops to 1.3 & 1.9 respectfully under LED load. I’ve turned off everything I can think of that deals with OCS1&2.

@ DEVICE INTRC_OSC_NOCLKOUT,MCLR_OFF,BOD_OFF,WDT_OFF,LVP_OFF  
OSCCON=$70
ANSEL=$00
ADCON0=$00

[mackrackit]

This is for MPASM..

@ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF

Notice the E on MCLR E

[Bruce]

If only RB3 causes your problem, then I suspect you're simply not getting LVP turned off.

It would really help if you posted your code.

[Archangel]

You got analog all to heck on port B, shut off the comparators and don't forget anselh