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'[PIC]: 16F84A programming problems ...'
2001\04\03@035935 by Caisson

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Hello All,

 I've seen messages asking for differences between the "normal" (16F84)
and the "A" versions.  In respect to to coding there seems not to have
changed anything.

But I've got a problem in transferring the code to the controller
(programming).  I can program a normal 16F84, but a 16F84A will aport
within a few (0 thru 50) cycles with an error.  Even stranger, when I moved
the programmer to another computer, all went
Allright ...

My programmer is a minimalistic one, connected to the printerport. The
digital pulses on the controller itself are therefore quite ugly
(rounded-off).  Because of the Schmitt-trigger inputs of the 16F84 on RB6 &
RB7 this did not pose a problem.

But I'm getting the vague idea that the 16F84A is missing those (the
Schmitt-trigger input's on the Data & Clock inputs) ...

Can anyone substanciate my suspicions ?

Regards,
 Rudy Wieser

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2001\04\03@130444 by iklas Wennerstrand

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It's a different programming algoritm.
Look under http://www.microchip.com -> litterature -> programming spec

Niklas

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Ämne: [PIC]: 16F84A programming problems ...

Hello All,

 I've seen messages asking for differences between the "normal" (16F84)
and the "A" versions.  In respect to to coding there seems not to have
changed anything.

But I've got a problem in transferring the code to the controller
(programming).  I can program a normal 16F84, but a 16F84A will aport
within a few (0 thru 50) cycles with an error.  Even stranger, when I moved
the programmer to another computer, all went
Allright ...

My programmer is a minimalistic one, connected to the printerport. The
digital pulses on the controller itself are therefore quite ugly
(rounded-off).  Because of the Schmitt-trigger inputs of the 16F84 on RB6 &
RB7 this did not pose a problem.

But I'm getting the vague idea that the 16F84A is missing those (the
Schmitt-trigger input's on the Data & Clock inputs) ...

Can anyone substanciate my suspicions ?

Regards,
 Rudy Wieser

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2001\04\04@031412 by Caisson

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> Van: Niklas Wennerstrand <niklas.wennerstrandspamKILLspamTELIA.COM>
> Aan: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
> Onderwerp: [PIC]: 16F84A programming problems ...
> Datum: dinsdag 3 april 2001 19:08

Hello Niklas,

> It's a different programming algoritm.
> Look under http://www.microchip.com -> litterature -> programming spec

The algorithm seems not to be the problem: on another computer the
programmer (and the software) works O.K.

So, It looks to me it's something related to the Hardware ...

Regards,
 Rudy Wieser


{Quote hidden}

moved
> the programmer to another computer, all went
> Allright ...
>
> My programmer is a minimalistic one, connected to the printerport. The
> digital pulses on the controller itself are therefore quite ugly
> (rounded-off).  Because of the Schmitt-trigger inputs of the 16F84 on RB6
&
> RB7 this did not pose a problem.
>
> But I'm getting the vague idea that the 16F84A is missing those (the
> Schmitt-trigger input's on the Data & Clock inputs) ...
>
> Can anyone substanciate my suspicions ?
>
> Regards,
>   Rudy Wieser

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2001\04\04@035641 by Bob

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Hmm, according to my datasheet for the 16F84A (35007a.pdf), it looks like B6 &
B7 are also schmitt trigger during serial programming mode.

Looking on page 59 of that datasheet (revision history), shows that the F84A
differs from the F84 in respects to the following

                                   F84             F84A
Data memory size    36x8            68x8
Voltage range           2~6              2~5.5
Max speed (mhz)      10                20
MCLR on chip filter   No               Yes
RB0/INT                      TLL             TLL/ST (Schmitt Trigger)

These are must "some" of the differences listed.  Get the datasheet for the F84A
to see all the differences.


{Original Message removed}

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