trouble with my 16f84a

[Bruce]

Does this work?

P_Val VAR BYTE
TRISB=0

start:
  P_VAL=2  ' RB0=0, RB1=1
  portb = P_VAL
  pause 500
  P_VAL=1 ' RB0=1, RB1=0
  portb = P_VAL
  pause 500
  goto start

[aratti]

pin 4= POSITIVE with 47k resistor

pin 5= NEGATIVE

PIN 6 AND 7= LEDs with 470 ohm resistors(and yes, the polarity is correct)

pin 14 =positive

pin 15 and 16 =crystal with two 22 pf caps attached to ground

I have never seen a 47K resistor on reset pin! Tray a 10K

Pin 5 negative? , surely you mean ground !

crystal with two 22 pf caps attached to ground (4 MHz?)

In your program modify pause to 5000, then with a DVM measure port pins. If you see both pins turning on & off then you have a bad ground or a bad resistor or a bad led connected to the led that doesn't work. On the other hand if you don't see the +5 volts ont both pins than you have a bad pic.

Appart from that I don't see reason for your leds not blinking.

Al.

[Acetronics2]

Hi, Shawn

Could you post your HEX code ( not Basic ! ) ???

I think it's the only way to verify what you put into your Pic ... ( Mr de la Pallice dixit )

Alain

[cavity creep]

I have never seen a 47K resistor on reset pin! Tray a 10K

Pin 5 negative? , surely you mean ground !

crystal with two 22 pf caps attached to ground (4 MHz?)

In your program modify pause to 5000, then with a DVM measure port pins. If you see both pins turning on & off then you have a bad ground or a bad resistor or a bad led connected to the led that doesn't work. On the other hand if you don't see the +5 volts ont both pins than you have a bad pic.

Appart from that I don't see reason for your leds not blinking.

Al.

For this particular PIC at least , it seems to be the norm to use a 47k resistor. The crystal is 4 mhz. And yes,I meant ground:P
I tried what you recommended , and checked the pins.I am getting a very tiny voltage value ( the last was 35.6 mV.).I've got a feeling I have a couple of bad chips, unless someone can think of another reason for this

Alain I'm going to post the Hex listing here of the most recent wink program.Thanks for taking a look at it.

:1000000028288F018E00FF308E07031C8F07031CEA
:10001000232803308D00DF300F2003288D01E83EB8
:100020008C008D09FC30031C18288C070318152838
:100030008C0764008D0F15280C181E288C1C222894
:1000400000002228080083130313831264000800B1
:1000500006148316061083128610831686108312E8
:1000600013308F008830022006108316061083128A
:10007000861483168610831213308F008830022076
:060080002828630041285E
:02400E00FD3F74
:00000001FF

[mackrackit]

For this particular PIC at least , it seems to be the norm to use a 47k resistor.

???
Do you mean 4.7K

[cavity creep]

Yes I did.Apologies for the typos.

[mackrackit]

Yes I did.Apologies for the typos.

Darn, that probably would have been the problem.

I do not have an 84A to test your HEX with, but I can say the fuses are correct.
I do not think it will make a difference, but you may try setting the WatchDogTimer to OFF??

[cavity creep]

Would you believe that did the trick?????

Thanks you so much! Can you give a little insight into what exactly is going on with the timers?I'm certain I'll run into this again.

Thanks again to everybody for their insight

Shawn