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'16F877 Programming difficulties'
1999\08\06@172922 by Dave Johnson

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Just a quick note in case this jogs anyone's memory:

I'm trying to program a PIC16F877 on my board, it's a TQFP package, I
have a 5X2 pin header for programming, identical setup to my last project
using a 16F84 (jumpered for operation).

I built a programming cable with a 40 pin socket on one end and a 5X1
plug for the header on the other, I'm using a Picstart+. Again, this is
the same way I did it for the 16f84.

16F877s in a DIP package program just fine in the Picstart, but when I
plug in the cable and plug that into a board I can't get it to program, I
get various errors, including "Cannot Transmit", "Cannot Receive", just
plain "Failure" in the program/verify window, and occasionally something
like "Command 8F not echoed properly (F8)".

Does anyone have any clue what might be wrong? Or suggestions on what to
look for? The cable checks out fine with the ohmmeter, it's about 8
inches long and shielded, so should be electrically fine. I'm stumped.

Dave Johnson

1999\08\06@183027 by kfinney

picon face
Can't help, but I can commiserate. I was just whining about this
happening yesterday. We're using PICSTART Plus, also. Funny thing
is, of three 877s on my desk, this is the only one to behave
like this. Now, with the good ones, I did get a lot of "Cannot
Transmit" Cannot Receive", etc. but they still take the bits.
This particular specimen took the bits once just fine, then suddenly
began reporting failure after finishing address 1FFF. A read
indicates that the original successful (but buggy) code is still
there.

>
> Just a quick note in case this jogs anyone's memory:
>
> I'm trying to program a PIC16F877 on my board, it's a TQFP package, I
> have a 5X2 pin header for programming, identical setup to my
> last project
> using a 16F84 (jumpered for operation).
>
> I built a programming cable with a 40 pin socket on one end and a 5X1
> plug for the header on the other, I'm using a Picstart+.
> Again, this is
> the same way I did it for the 16f84.
>
> 16F877s in a DIP package program just fine in the Picstart,
> but when I
> plug in the cable and plug that into a board I can't get it
> to program, I
> get various errors, including "Cannot Transmit", "Cannot
> Receive", just
> plain "Failure" in the program/verify window, and
> occasionally something
> like "Command 8F not echoed properly (F8)".
>
> Does anyone have any clue what might be wrong? Or
> suggestions on what to
> look for? The cable checks out fine with the ohmmeter, it's about 8
> inches long and shielded, so should be electrically fine.
> I'm stumped.
>
> Dave Johnson
>


'16F877 Programming difficulties'
1999\09\07@163914 by Larry G. Nelson Sr.
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The Picstart+ is not designed for in circuit serial programming. It can do
it under some circumstances but the drivers are not powerful enough to
reliably work in this capacity. If there is other circuitry on your board
that can pull the supply down. The best bet is a Promate with the ICSP
adaptor. I know it is more expensive but it does work reliably as long as
you follow the rules.


At 02:18 PM 8/6/99 -0700, you wrote:
{Quote hidden}

Larry G. Nelson Sr.
spam_OUTL.NelsonTakeThisOuTspamieee.org
http://www.ultranet.com/~nr

1999\09\07@224558 by Jim Robertson

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At 11:02 3/09/99 -0400, you wrote:



Make sure the LVP pin is help LOW on your target board. It is pin 36 on the
40-pin dip parts but you will have to look it up for your SMD part. Chances
are this will see you right.


-Jim


{Quote hidden}

Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: newfoundspamKILLspampipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________

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