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'16f87xa PROGRAMMING'
2002\08\21@084948 by Wouter van Ooijen

face picon face
next programmning problem....

I am trying to program 16f87xA chips. The values I read from the ID
location are nowhere near what uChip describes:
16f873A: 0x0800 (uChip: 0E2x)
16f874A: 0x0820 (uChip: 0E6x)
16f876A: 0x0800 (uChip: 0E0x)

Besides that other things don't seem to work either...

Wouter van Ooijen

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2002\08\21@104322 by Tal Dayan

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face
These chips use different algorithm than th e16f87x (no 'A').

The only programmer I am aware of that program them is the WARP 13 (check
for it latest variation).

Last time I checked (few weeks ago), even Microchip's PicStart did not
support it.

Tal

> {Original Message removed}

2002\08\21@105618 by Wouter van Ooijen

face picon face
> These chips use different algorithm than th e16f87x (no 'A').
>
> Last time I checked (few weeks ago), even Microchip's PicStart did not
> support it.

I know, PS+ does not know them. But to start I just try to read, which
(from the programming manual) uses the same algorithm as the other
14-bit flash chips. And I do read something at 0x2006 that looks like a
device ID, just not the value uChip mentions in the prog man. And I get
the same value for two different chips!

Wouter van Ooijen

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2002\08\21@161839 by Peter L. Peres

picon face
On Wed, 21 Aug 2002, Wouter van Ooijen wrote:

>next programmning problem....
>
>I am trying to program 16f87xA chips. The values I read from the ID
>location are nowhere near what uChip describes:
>16f873A: 0x0800 (uChip: 0E2x)
>16f874A: 0x0820 (uChip: 0E6x)
>16f876A: 0x0800 (uChip: 0E0x)
>
>Besides that other things don't seem to work either...

Weren't you just saying the published algorythms work for you ?

Peter

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2002\08\21@164359 by Wouter van Ooijen
face picon face
> Weren't you just saying the published algorythms work for you ?

I say I do read something that looks suspiciously like a device ID, in
fact the format is more like the device ID of other flash PIC chips than
what uChip states in the 16f87xA programming manual. But so far no
sucess with code write/readback.

BTW I did get 18f programming working.

Wouter

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2002\08\22@083652 by Wouter van Ooijen

face picon face
(banging my head against the wall)

The strange results I got where cause by 16f874a and a 16f877 being
wired in parallel! I seems they are both still operational, and with the
16f877 removed I can indeed read the ID values that uChip states.

Wouter

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2002\08\22@202250 by Peter L. Peres

picon face
On Wed, 21 Aug 2002, Wouter van Ooijen wrote:

>> Weren't you just saying the published algorythms work for you ?
>
>I say I do read something that looks suspiciously like a device ID, in
>fact the format is more like the device ID of other flash PIC chips than
>what uChip states in the 16f87xA programming manual. But so far no
>sucess with code write/readback.

I meant in the other thread, when I asked whether the published algorythm
works for 16F877. I do not yet know the difference between a 877A and a
877 (isn't a 877 a valve ?).

>BTW I did get 18f programming working.

Ok.

Peter

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2002\08\22@214942 by Peter L. Peres

picon face
On Thu, 22 Aug 2002, Wouter van Ooijen wrote:

>(banging my head against the wall)
>
>The strange results I got where cause by 16f874a and a 16f877 being
>wired in parallel! I seems they are both still operational, and with the
>16f877 removed I can indeed read the ID values that uChip states.

How did you manage to do that ?! One soscketed one in ICSP on the same
programmer ? Did I guess right ? (now why am I saying this ...)

Peter

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2002\08\23@030717 by Wouter van Ooijen

face picon face
> How did you manage to do that ?! One soscketed one in ICSP on the same
> programmer ? Did I guess right ? (now why am I saying this ...)

Correct. I have a programmer with a ZIF socket (for programming chips
with WLoader), but it also has a connector for ICSP. After some
frustration with the 18f452 chip in the socket I switched to a 16f242
(28 pin, does not fit in socket, so using the ICSP connector). Did not
work either, so disconnect and put a 16f877 in the socket (for
comparison). Worked flawlessly, so back to the 16242 (*oops* forgot to
remove the 16f877!). The ID that I read was the AND of the IDs of both
chips, which confirms theory that pull-down is stronger than pull-up.

Now why do those damn 16F87xA's refuse to oscillate?

Wouter van Ooijen

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