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PICList Thread
'16F8XX RAM map'
2000\04\11@200324 by Tony Nixon

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Can anyone verify that the 16F873/4 RAM at 70h - 7Fh is not the same in
each page as in the 16F876/7 chips.

Even the newer 16F870/1 chips have these RAM locations duplicated in
each page.

I was wondering if there was a print error because there is a reference
to these addresses in the 16F873/4 data sheet.

--
Best regards

Tony

http://www.picnpoke.com
spam_OUTsalesTakeThisOuTspampicnpoke.com

2000\04\12@044554 by Tom Handley

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  Tony, I've not used the 16F873/874 devices but I have used the
16F876/877. According to the data book (DS30292A), the upper 16 Bytes are
aliased to 70h-7Fh in the 876/877 and are separate in the 873/874. This
provides compatibility with the 73/74 and 76/77 devices. Hopefully
someone else has F873/874 devices to verify this but I think this is the
case. But with Microchip's data books, `Lord only knows'...

  - Tom

At 09:38 AM 4/12/00 +1000, Tony Nixon wrote:
{Quote hidden}

------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

2000\04\12@102735 by mike

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On Wed, 12 Apr 2000 00:14:53 -0700, you wrote:

>   Tony, I've not used the 16F873/874 devices but I have used the
>16F876/877. According to the data book (DS30292A), the upper 16 Bytes are
>aliased to 70h-7Fh in the 876/877 and are separate in the 873/874. This
>provides compatibility with the 73/74 and 76/77 devices. Hopefully
>someone else has F873/874 devices to verify this but I think this is the
>case. But with Microchip's data books, `Lord only knows'...
>
>   - Tom
>
>At 09:38 AM 4/12/00 +1000, Tony Nixon wrote:
>>Can anyone verify that the 16F873/4 RAM at 70h - 7Fh is not the same in
>>each page as in the 16F876/7 chips.
>>
Yes - the F874/4 were designed to be drop-in compatible to 16C73/4.
The F876/7  devices are 'enhanced' with this 'shared' RAM block. It
would have been nice if they'd made this feature switchable..

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