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Discussion Groups | 68HC12 | DP256 Bootloader

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

9S12E128 - rajasreean - Jun 8 23:38:00 2004

My application reqiress 24K of data memory .
The present chip 9S12E128 provides only 8K of data memory.
Can anybody suggest a method to expand this 8K to 24K data.
Motorola site provides a lot of information on expanding program
memory but noe specifies expanding data memory.
Can anybody heplp me on this ?




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Re: 9S12E128 - Andrew Lohmann's New Email Server - Jun 9 3:50:00 2004


> My application reqiress 24K of data memory .
The present chip 9S12E128 provides only 8K of data memory.
Can anybody suggest a method to expand this 8K to 24K data.
Motorola site provides a lot of information on expanding program
memory but noe specifies expanding data memory.
Can anybody heplp me on this ?

Have a look at the Motorola website there are a number of application notes, which do include mistakes. Also look at Axiom and Technilogical Arts who both may let you see circuit diagrams. The significant point is to use !XCS pin to drive the clock pin of an 74AC373 address latch, this makes the timming much less stringent. Using A or XA pins for addressing does not make any difference. Also watch that signal voltage levels it is easiest to use 3.3V supply.

I believe that if you also want to use some paged data memory you would need to combine !XCS & !ECS, and add a small amount of decoding e.g. XA19 connected to RAM !CS, but I have not tried this yet myself. Andrew Lohmann AIIE
Design Engineer

PLEASE NOTE NEW EMAIL ADDRESS IS: Bellingham + Stanley Ltd.
Longfield Road, Tunbridge Wells, Kent, TN2 3EY, England.
Tel: +44 (0) 1892 500400
Fax: +44 (0) 1892 543115
Website: www.bs-ltd.com

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




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OT - CAN Connectors - Bob Furber - Jun 9 16:42:00 2004

I wonder if a standard, or even a preference, has emerged for CAN
connectors?

So far, I have seen screw terminals and RJ45 used on sbc's to connect to CAN
networks.

Does anybody on this list have views on this?

Thanks,

Bob Furber

__________________________________________________________

Connect your micro to the internet the easy way
www.microcommander.com

Microcontroller with an obscenity of I/O & features
..in a small footprint www.steroidmicros.com
__________________________________________________________




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Re: OT - CAN Connectors - Steve Letkeman - Jun 9 16:55:00 2004

The CiA have a published list of CAN connectors including D-9 and various
military and circular connectors. You can find the document on their
web page or I can email it to you directly. I have used RJ45 for CAN
for the past 8 years but they ignored my suggestion and went with
their own, go figure :-(
Steve

Steven D. Letkeman BSc.
President - Zanthic Technologies Inc.
403-526-8318
www.zanthic.com Embedded micro-controllers and CAN interfaces
www.brightan.com Automated lighting systems

----- Original Message -----
From: Bob Furber
To:
Sent: Wednesday, June 09, 2004 3:42 PM
Subject: [68HC12] OT - CAN Connectors I wonder if a standard, or even a preference, has emerged for CAN
connectors?

So far, I have seen screw terminals and RJ45 used on sbc's to connect to CAN
networks.

Does anybody on this list have views on this?

Thanks,

Bob Furber

__________________________________________________________

Connect your micro to the internet the easy way
www.microcommander.com

Microcontroller with an obscenity of I/O & features
..in a small footprint www.steroidmicros.com
__________________________________________________________
--------------------------------------------------------To learn more about Motorola Microcontrollers, please visit
http://www.motorola.com/mcu
o learn more about Motorola Microcontrollers, please visit
http://www.motorola.com/mcu
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DP256 Bootloader - Jeff McKnight - Jun 10 7:40:00 2004


Hello,
Could anyone tell me if they have successfully assembled the code in
AN2153 for the DP256 serial bootloader ? If so, could you please
tell me what assembler you used ?

I have been trying for several days with three different assemblers
and can not seem to make it compatible with any of them - too many
errors to list them all here.

Any help would be greatly appreciated.

Thanks,
Jeff






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Re: DP256 Bootloader - Peter Lissenburg - Jun 10 8:10:00 2004

I did it with MINIDE from
http://www.mgtek.com/
it was some time ago, and so the memory fades, but I may have had to do a
couple of global search and replaces.

Hope that helps.
PL
At 08:40 AM 10/06/2004 -0400, you wrote:

>Hello,
>Could anyone tell me if they have successfully assembled the code in
>AN2153 for the DP256 serial bootloader ? If so, could you please
>tell me what assembler you used ?
>
> I have been trying for several days with three different assemblers
>and can not seem to make it compatible with any of them - too many
>errors to list them all here.
>
>Any help would be greatly appreciated.
>
>Thanks,
>Jeff >
>--------------------------------------------------------To learn more
>about Motorola Microcontrollers, please visit
>http://www.motorola.com/mcu
>o learn more about Motorola Microcontrollers, please visit
>http://www.motorola.com/mcu
>
>Yahoo! Groups Links




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Re: DP256 Bootloader - theobee00 - Jun 10 16:56:00 2004

--- In , Jeff McKnight <jeff@a...> wrote:

> Could anyone tell me if they have successfully assembled the code in
> AN2153 for the DP256 serial bootloader ? If so, could you please
> tell me what assembler you used ?
>
> I have been trying for several days with three different assemblers
> and can not seem to make it compatible with any of them - too many
> errors to list them all here.

I think the header file with global equates is missing.

The section dealing with serial transmission I got working and is available in the Yahoo files area.

One day I might have look see if the S2 loader is worth the trouble.
(I am using an old S1-S9, no paged adresses needed over here yet)

Cheers,

Theo




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