trouble with my 16f84a

[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

[mackrackit]

The data sheet says it best. If not, let us know.

6.10 Watchdog Timer (WDT)
The Watchdog Timer is a free running On-Chip RC
Oscillator which does not require any external
components. This RC oscillator is separate from the
RC oscillator of the OSC1/CLKIN pin. That means that
the WDT will run even if the clock on the OSC1/CLKIN
and OSC2/CLKOUT pins of the device has been
stopped, for example, by execution of a SLEEP
instruction. During normal operation, a WDT time-out
generates a device RESET. If the device is in SLEEP
mode, a WDT wake-up causes the device to wake-up
and continue with normal operation. The WDT can be
permanently disabled by programming configuration bit
WDTE as a '0' (Section 6.1).
6.10.1 WDT PERIOD
The WDT has a nominal time-out period of 18 ms, (with
no prescaler). The time-out periods vary with
temperature, VDD and process variations from part to
part (see DC specs). If longer time-out periods are
desired, a prescaler with a division ratio of up to 1:128
can be assigned to the WDT under software control by
writing to the OPTION_REG register. Thus, time-out
periods up to 2.3 seconds can be realized.
The CLRWDT and SLEEP instructions clear the WDT
and the postscaler (if assigned to the WDT) and prevent
it from timing out and generating a device
RESETcondition.
The TO bit in the STATUS register will be cleared upon
a WDT time-out.