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PICList Thread
'[PIC] New HTP parts?'
2006\05\31@082207 by Gerhard Fiedler

picon face
Xiaofan Chen wrote (in "Re: [PIC]: Programming data memory: both 0/1 can be
written ?"):

> Take note there are now new PICs and dsPICs using new CMOS technology and
> they do not have EEPROMs. The examples are the new 18J PICs and
> dsPIC33s.
>
> An interesting discussion here: http://forum.microchip.com/tm.aspx?m=163825

Does that sound alarming to anyone else? I agree with the base line of the
thread that "HTP" parts (flash with an endurance of 100 writes only) are
pretty bad news. Does anybody know whether this is where Microchip is
heading?

Gerhard

2006\05\31@223227 by Xiaofan Chen

face picon face
On 5/31/06, Gerhard Fiedler <spam_OUTlistsTakeThisOuTspamconnectionbrazil.com> wrote:

> > Take note there are now new PICs and dsPICs using new CMOS
> > technology and they do not have EEPROMs. The examples are the
> > new 18J PICs and  dsPIC33s.
> >
> > An interesting discussion here: http://forum.microchip.com/tm.aspx?m=163825
>
> Does that sound alarming to anyone else? I agree with the base line of the
> thread that "HTP" parts (flash with an endurance of 100 writes only) are
> pretty bad news. Does anybody know whether this is where Microchip is
> heading?
>
> Gerhard

I do not know but I believe that Microchip will have to outsource the
higher-end chips to be competitive. But maybe outsourcing to a better
foundry will at least produce "HTTP" parts instead of "HTP" parts.

By the way, do you want something more than "HTTP"? How about
virtually unlimited read/write cycles?
http://www.eetimes.com/news/design/showArticle.jhtml;jsessionid=XMX3Y3G0XL3YQQSNDBECKH0CJUMEKJVN?articleID=188700327

The price seems to be on the high side.

Regards,
Xiaofan

2006\05\31@230230 by kravnus wolf

picon face
While we are on this topic. What is the rating for
RAM. How many read and write cycle before failure? How
about thumbdrives?

John

--- Xiaofan Chen <.....xiaofancKILLspamspam@spam@gmail.com> wrote:

{Quote hidden}

www.eetimes.com/news/design/showArticle.jhtml;jsessionid=XMX3Y3G0XL3YQQSNDBECKH0CJUMEKJVN?articleID=188700327
>
> The price seems to be on the high side.
>
> Regards,
> Xiaofan
> --

2006\05\31@231832 by Bob Axtell

face picon face
Xiaofan Chen wrote:
{Quote hidden}

I think that Microchip is simply admitting what some of us already know:
they have a problem with their flash process.

--Bob


'[PIC] New HTP parts?'
2006\06\01@064552 by Gerhard Fiedler
picon face
Xiaofan Chen wrote:

> By the way, do you want something more than "HTTP"?

Actually, HTTP is fine with me. I'm mainly concerned about the development
cycle -- HTP may be ok, but is a bit on the short side.

> How about virtually unlimited read/write cycles?
> http://www.eetimes.com/news/design/showArticle.jhtml;jsessionid=XMX3Y3G0XL3YQQSNDBECKH0CJUMEKJVN?articleID=188700327

Nice... :)  The 8051 has some interesting derivatives.

> The price seems to be on the high side.

And hard to get, it seems.

Gerhard

2006\06\02@102748 by alan smith

picon face
Not alarming in the fact...this is talking about the program memory.  When your in production, how many times are you really writing and rewriting?  Unless your constantly updating the firmware in the field.....once is usually enough.

kravnus wolf <EraseMEkravnusspam_OUTspamTakeThisOuTyahoo.com> wrote:  While we are on this topic. What is the rating for
RAM. How many read and write cycle before failure? How
about thumbdrives?

John

--- Xiaofan Chen wrote:

> On 5/31/06, Gerhard Fiedler
>
wrote:
{Quote hidden}

www.eetimes.com/news/design/showArticle.jhtml;jsessionid=XMX3Y3G0XL3YQQSNDBECKH0CJUMEKJVN?articleID=188700327
>
> The price seems to be on the high side.
>
> Regards,
> Xiaofan
> --

2006\06\02@110040 by Xiaofan Chen

face picon face
On 6/2/06, alan smith <micro_eng2spamspam_OUTyahoo.com> wrote:
> Not alarming in the fact...this is talking about the program memory.
> When your in production, how many times are you really writing and
> rewriting?  Unless your constantly updating the firmware in the field.....
> once is usually enough.

Yes it will be okay most of the time. One drawback of these HTP
parts is that they do not have EEPROM. Being HTP means that
they are not possible to use the flash as data memory.

Another thing is that it makes people worry psychologically...
This is one of the worst Flash technology around...
I only know that very old parts like 68HC912B32 has similar
Flash rewrite specifications.

Regards,
Xiaofan

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