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Discussion Groups | | RAM/EEPROM on the 68HC11F1


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RAM/EEPROM on the 68HC11F1 - ingo68hc11 - Jun 26 1:03:00 2002

Hi group!

Is it possible to connect SRAM/EEPROM directly,
i.e. WITHOUT ANY glue logic, to the data/address bus
of the 68HC11F1?
For example using Program Chip-Select as chip select
for the the EEPROM ($8000-$FFFF) and address line 15
as chip select for 32k-SRAM located from $0000-$7FFF ?

Can Chip-Select lines and Output Enable pins be connected ?

Thank you,
Ingo.


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RE: RAM/EEPROM on the 68HC11F1 - Meer, T.A. ter - Jun 26 1:26:00 2002

The PSD devices for STMicroelectronics (containing both flash memory and ram) can be directly connected to your
microcontroller.

Theo. > -----Original Message-----
> From: ingo68hc11 [mailto:]
> Sent: Wednesday, June 26, 2002 8:03 AM
> To:
> Subject: [m68HC11] RAM/EEPROM on the 68HC11F1 > Hi group!
>
> Is it possible to connect SRAM/EEPROM directly,
> i.e. WITHOUT ANY glue logic, to the data/address bus
> of the 68HC11F1?
> For example using Program Chip-Select as chip select
> for the the EEPROM ($8000-$FFFF) and address line 15
> as chip select for 32k-SRAM located from $0000-$7FFF ?
>
> Can Chip-Select lines and Output Enable pins be connected ?
>
> Thank you,
> Ingo. > ------------------------ Yahoo! Groups Sponsor
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> To unsubscribe from this group, send an email to: >
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>



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Re: RAM/EEPROM on the 68HC11F1 - Kheng-Teong Goh - Jun 26 1:35:00 2002

Ingo> Is it possible to connect SRAM/EEPROM directly,
>Ingo> i.e. WITHOUT ANY glue logic, to the data/address bus
>Ingo> of the 68HC11F1?

Theoretically YES. It has been done. Some examples,
http://www.pmb.co.nz/index.html
http://www.aspisys.com/f1.htm >Ingo> For example using Program Chip-Select as chip select
>Ingo> for the the EEPROM ($8000-$FFFF) and address line 15
>Ingo> as chip select for 32k-SRAM located from $0000-$7FFF ?

I'm not sure, I tried it, but doesn't work for me

>Ingo> Can Chip-Select lines and Output Enable pins be connected ?

Yes. But then again maybe not for all.
On 68HC11F1, u can use CSGEN for RAM Chip Select and CSPROG for EEPROM chip
select.
(Check out the schematics in the pmb.cp.nz homepage.) (I'm not getting
commission of any sort).

Best regards,
Kheng Teong






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Re: RAM/EEPROM on the 68HC11F1 - Clifford Heath - Jun 26 2:41:00 2002

> On 68HC11F1, u can use CSGEN for RAM Chip Select and CSPROG for EEPROM chip
> select.
> (Check out the schematics in the pmb.cp.nz homepage.)

It's "pmb.co.nz" - a typo. I have one of Paul Bealing's boards - nice.

Clifford Heath





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