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Discussion Groups | 68HC12 | Info on the MC9S12A256B

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

Info on the MC9S12A256B - Jared O'Mara - Sep 16 15:28:00 2002

Hello guys,

So my Motorola rep still hasn't made me feel good about the direction the
812A4 is going. He talked about the end of life gives you 6 months to order
and 1 year for shipment (yada yada). That doesn't give me a migration path
for my product(s) after that. So I'm looking for some info on the 'S'
family. Specifically the MC9S12A256B.

The memory map (figure 1.2, page 21 of device guide) shows the 16k block
starting at 0x4000 is page 3E and the block starting at 0xC000 to be page
3F. This makes me think there is 1meg of addressable external memory area
even though the block starting at 0x8000 says 16 x 16k (don't know where the
other 45 blocks went). From my training with the A4, PPAGE means flash
area, but since there is only one external area here, can't this be RAM?
Are both the internal 256k flash and the external 1M area available at the
same time or do I lose some internal space by occupying the external area?

Someone (I believe Oliver) spoke about one of the processor's temperamental
oscillator and the need for a canned osc. Was that the star family? I only
paid loose attention since it wasn't my processor.

Any other insights, gripes, or general information would be appreciated.
I'm a hardware engineer learning to do embedded C so even if your thought
seems elementary, share it. It may help. Thanks.

Jared
[Non-text portions of this message have been removed]




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Re: Info on the MC9S12A256B - Francois - Sep 16 16:04:00 2002

Hi,

The A4 has a coupala chip select lines for buss expansion - it seems that
the S family dropped
this feature?? Is this true or am I missing something here?? It seems like a
GAL/PLD or Xillings for buss decoding will then be a standard feature for
the S family for buss expansion - can someone confirm this please.
----- Original Message -----
From: "Jared O'Mara" <>
To: "68HC12 List" <>
Sent: Monday, September 16, 2002 1:28 PM
Subject: [68HC12] Info on the MC9S12A256B > Hello guys,
>
> So my Motorola rep still hasn't made me feel good about the direction the
> 812A4 is going. He talked about the end of life gives you 6 months to
order
> and 1 year for shipment (yada yada). That doesn't give me a migration
path
> for my product(s) after that. So I'm looking for some info on the 'S'
> family. Specifically the MC9S12A256B.
>
> The memory map (figure 1.2, page 21 of device guide) shows the 16k block
> starting at 0x4000 is page 3E and the block starting at 0xC000 to be page
> 3F. This makes me think there is 1meg of addressable external memory area
> even though the block starting at 0x8000 says 16 x 16k (don't know where
the
> other 45 blocks went). From my training with the A4, PPAGE means flash
> area, but since there is only one external area here, can't this be RAM?
> Are both the internal 256k flash and the external 1M area available at the
> same time or do I lose some internal space by occupying the external area?
>
> Someone (I believe Oliver) spoke about one of the processor's
temperamental
> oscillator and the need for a canned osc. Was that the star family? I
only
> paid loose attention since it wasn't my processor.
>
> Any other insights, gripes, or general information would be appreciated.
> I'm a hardware engineer learning to do embedded C so even if your thought
> seems elementary, share it. It may help. Thanks.
>
> Jared >
> [Non-text portions of this message have been removed] >
> --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu





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Re: Info on the MC9S12A256B - Carl Barnes - Sep 16 16:46:00 2002

Jared,

As I posted last week, there are no plans for the 'A4 to go "EOL", so I
wouldn't start worrying yet.

Best regards,
Carl Barnes
www.technologicalarts.com
>>modular HC11 and HC12 boards<<

Jared O'Mara wrote:
>
> Hello guys,
>
> So my Motorola rep still hasn't made me feel good about the direction
> the
> 812A4 is going. He talked about the end of life gives you 6 months to
> order
> and 1 year for shipment (yada yada). That doesn't give me a migration
> path
> for my product(s) after that. So I'm looking for some info on the 'S'
> family. Specifically the MC9S12A256B.
>
> The memory map (figure 1.2, page 21 of device guide) shows the 16k
> block
> starting at 0x4000 is page 3E and the block starting at 0xC000 to be
> page
> 3F. This makes me think there is 1meg of addressable external memory
> area
> even though the block starting at 0x8000 says 16 x 16k (don't know
> where the
> other 45 blocks went). From my training with the A4, PPAGE means
> flash
> area, but since there is only one external area here, can't this be
> RAM?
> Are both the internal 256k flash and the external 1M area available at
> the
> same time or do I lose some internal space by occupying the external
> area?
>
> Someone (I believe Oliver) spoke about one of the processor's
> temperamental
> oscillator and the need for a canned osc. Was that the star family?
> I only
> paid loose attention since it wasn't my processor.
>
> Any other insights, gripes, or general information would be
> appreciated.
> I'm a hardware engineer learning to do embedded C so even if your
> thought
> seems elementary, share it. It may help. Thanks.
>
> Jared
>
> [Non-text portions of this message have been removed]
>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> [Image] >
> --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )

RE: Info on the MC9S12A256B - Jared O'Mara - Sep 17 7:01:00 2002

I am a little concerned. Hopefully for no reason. Our Motorola FAE took a
couple of us to lunch yesterday to make us feel better. He told us he was
surprised the A4 went from 3 (PRODUCT STABLE GROWTH/MATURITY) to 5 (PRODUCT
DECLINE) without a stop at 4 (PRODUCT MATURITY/SATURATION). He said the
time in either stage 3 or stage 4 is 3-4 years and 1-2 years in 5 before
going to EOL. My product should not have a problem with that 1-2 years plus
the couple of years to buy when in EOL. There is also stock on shelves of
distributors like Future and Arrow. At the same time I need to address that
the chip is no longer suggested for new designs to my bosses. They are not
technical people and I need to explain the migration path if one is
available. That's why I doing this research now.

Jared

-----Original Message-----
From: Carl Barnes [mailto:]
Sent: Monday, September 16, 2002 5:47 PM
To:
Subject: Re: [68HC12] Info on the MC9S12A256B

Jared,

As I posted last week, there are no plans for the 'A4 to go "EOL", so I
wouldn't start worrying yet.

Best regards,
Carl Barnes
www.technologicalarts.com
>>modular HC11 and HC12 boards<<

Jared O'Mara wrote:
>
> Hello guys,
>
> So my Motorola rep still hasn't made me feel good about the direction
> the
> 812A4 is going. He talked about the end of life gives you 6 months to
> order
> and 1 year for shipment (yada yada). That doesn't give me a migration
> path
> for my product(s) after that. So I'm looking for some info on the 'S'
> family. Specifically the MC9S12A256B.
>
> The memory map (figure 1.2, page 21 of device guide) shows the 16k
> block
> starting at 0x4000 is page 3E and the block starting at 0xC000 to be
> page
> 3F. This makes me think there is 1meg of addressable external memory
> area
> even though the block starting at 0x8000 says 16 x 16k (don't know
> where the
> other 45 blocks went). From my training with the A4, PPAGE means
> flash
> area, but since there is only one external area here, can't this be
> RAM?
> Are both the internal 256k flash and the external 1M area available at
> the
> same time or do I lose some internal space by occupying the external
> area?
>
> Someone (I believe Oliver) spoke about one of the processor's
> temperamental
> oscillator and the need for a canned osc. Was that the star family?
> I only
> paid loose attention since it wasn't my processor.
>
> Any other insights, gripes, or general information would be
> appreciated.
> I'm a hardware engineer learning to do embedded C so even if your
> thought
> seems elementary, share it. It may help. Thanks.
>
> Jared
>
> [Non-text portions of this message have been removed]
>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> [Image] >
> --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu




(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )