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PICList Thread
'Program Memory'
1998\04\20@110604 by tsk196

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Hello Engineers,
       I have this PIC17C44 that I am trying to erase for
a couple of hours using UV Eraser. But I simply can't seems
to erase the Program Memory.
       Presently, I have three PIC17C44. One of them can
be erase but the other two have this problem.
       Does this means that the PIC17C44 is spoil? Or
does it means that the UV Eraser is not working?
       Thanks in advance.
With regards,
Siong.
----------------------
Teik Siong
spam_OUTtsk196TakeThisOuTspamsoton.ac.uk

1998\04\20@114019 by Clewer,Brian

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Siong wrote,

>Hello Engineers,
>        I have this PIC17C44 that I am trying to erase for
>a couple of hours using UV Eraser. But I simply can't seems
>to erase the Program Memory.
>        Presently, I have three PIC17C44. One of them can
>be erase but the other two have this problem.
>        Does this means that the PIC17C44 is spoil? Or
>does it means that the UV Eraser is not working?
>        Thanks in advance.
>With regards,
>Siong.


It could mean either, but if you have used your code protection bit, your
pic will take days to clear (if at all).

Bye,
Brian.


'Program Memory'
1998\11\03@104035 by aya Baptista
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On the 16C84 programming specification, it is said that locations in range
0000-1FFF will access program memory, 2000-200F will access configuration
memory and 2010-3FFF will access "user memory". What is understood by "user
memory"? Is it normal program memory, ie. 3000 is equivalent to 1000? Or is
it RAM memory (SFRs)?

TIA,
AndrŽ Malafaya Baptista

1998\11\03@133040 by Andy Kunz

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At 03:38 PM 11/3/98 -0000, you wrote:
>On the 16C84 programming specification, it is said that locations in range
>0000-1FFF will access program memory, 2000-200F will access configuration
>memory and 2010-3FFF will access "user memory". What is understood by "user
>memory"? Is it normal program memory, ie. 3000 is equivalent to 1000? Or is
>it RAM memory (SFRs)?

it's a prgram code space used by the factory.\

==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\11\04@063238 by Dr. Imre Bartfai

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On Tue, 3 Nov 1998, Andy Kunz wrote:

> At 03:38 PM 11/3/98 -0000, you wrote:
> >On the 16C84 programming specification, it is said that locations in range
> >0000-1FFF will access program memory, 2000-200F will access configuration
> >memory and 2010-3FFF will access "user memory". What is understood by "user
> >memory"? Is it normal program memory, ie. 3000 is equivalent to 1000? Or is
> >it RAM memory (SFRs)?
>
> it's a prgram code space used by the factory.\
>
> ==================================================================
> Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
> ==================================================================
>
>
AFAIK,
the memory of that PIC in range 2100-213F is the EEPROM readable and
writable by the user.

Imre

1998\11\04@070039 by Caisson

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----------
> Van: AndrŽ  Malafaya Baptista               <.....ABaptistaKILLspamspam@spam@SE.EFACEC.PT>
> Aan: PICLISTspamKILLspamMITVMA.MIT.EDU
> Onderwerp: Program Memory
> Datum: dinsdag 3 november 1998 16:38
>
> On the 16C84 programming specification, it is said that locations in
range
> 0000-1FFF will access program memory, 2000-200F will access configuration
> memory and 2010-3FFF will access "user memory". What is understood by
"user
> memory"? Is it normal program memory, ie. 3000 is equivalent to 1000? Or
is
> it RAM memory (SFRs)?
>
> TIA,
> AndrŽ Malafaya Baptista

0000-1FFF -> User memory. Ony 0000 thru 03FF used : 1K code space
2000-200F -> Configuration memory. Can _not_ be accessed while running.
Only adres 2007 is important : contains the Configuration word.  2000-2003
are ID locations (7 bit wide) : Could be used as a Manufacturing-code or
Creation-date storage.
2100-213F -> EEProm memory. Accessible by special file-registers/routines
while running.

Data at adresses 2000-203F, 2140-and-up (excluding EEProm) can only be
accessed during Programming.

All other "memory" is Write-only :-)

Greetz,
 Rudy Wieser

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