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Discussion Groups | 68HC12 | EEPROM routines for MC9S12DP256

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

EEPROM routines for MC9S12DP256 - Author Unknown - Dec 10 15:53:00 2002

Hi All,

I saw a few posts regarding EEPROM routines for the MC9S12DP256 written in
assembly. If anyone has a set or example that they are willing to share it
would be a great time saver. Actually a routine in C would be ideal
but....

Please e-mail me at

Thanks in advance,
Dave Yanez

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




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Re: EEPROM routines for MC9S12DP256 - º´ÁÖ Áø - Dec 10 19:03:00 2002


if sombody had it, Pls. send it me too.
My mail is

wrote:Hi All,

I saw a few posts regarding EEPROM routines for the MC9S12DP256 written in
assembly. If anyone has a set or example that they are willing to share it
would be a great time saver. Actually a routine in C would be ideal
but....

Please e-mail me at

Thanks in advance,
Dave Yanez

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Re: EEPROM routines for MC9S12DP256 - Jordan Fuerst - Dec 10 19:09:00 2002

Me too.
----- Original Message -----
From: º´ÁÖ Áø
To:
Sent: Tuesday, December 10, 2002 5:03 PM
Subject: Re: [68HC12] EEPROM routines for MC9S12DP256
if sombody had it, Pls. send it me too.
My mail is

wrote:Hi All,

I saw a few posts regarding EEPROM routines for the MC9S12DP256 written in
assembly. If anyone has a set or example that they are willing to share it
would be a great time saver. Actually a routine in C would be ideal
but....

Please e-mail me at

Thanks in advance,
Dave Yanez

[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 Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ---------------------------------
µðÁöÅ» Ä«¸Þ¶ó¿Í Âû¶± ±ÃÇÕ - ¾ßÈÄ! »çÁø
Ä£±¸µé°ú ÇÔ²² ¹Ù²ãº¸¼¼¿ä - ¾ßÈÄ! ¸Þ½ÅÀú

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Re: EEPROM routines for MC9S12DP256 - Oliver Thamm - Dec 11 3:00:00 2002

Hi Dave,

the code below writes a sector (4bytes/2words) to the EEPROM of the DP256.
initEETS() must be called once during the initialization phase of your
program.

This code snippet is part of a new 'DP256 reference design, which I prepared
for Motorola recently. The whole stuff (source code and docs) can be downloaded
for free from Motorola web. Just go to the ACPRD Project Page and follow the links...

Happy HC(S)12ing!
Oliver -----------------------------------------------------
*** Oliver Thamm's HC12 Web *** http://hc12web.de ***
-----------------------------------------------------
> Hi All,

> I saw a few posts regarding EEPROM routines for the MC9S12DP256 written in
> assembly. If anyone has a set or example that they are willing to share it
> would be a great time saver. Actually a routine in C would be ideal
> but....

> Please e-mail me at

> Thanks in advance,
> Dave Yanez
//=============================================================================
// File: S12_EETS.C - V1.00
// Rem.: The ACPRD Project Page on the Web -> http://hc12web.de/acprd
//=============================================================================

//-- Includes -----------------------------------------------------------------

#include "datatypes.h"
#include <hcs12dp256.h>
#include "s12_eets.h"

//-- Code ---------------------------------------------------------------------

void initEETS(void) {

ECLKDIV = EETS_ECLKDIV; // set EEPROM Clock Divider Register
}

//-----------------------------------------------------------------------------

INT8 wrSectEETS(UINT16 *dest, UINT16 *src) {

// check addr: must be aligned 32 bit
if((UINT16)dest & 0x0003) return -1;
// check if ECLKDIV was written
if((ECLKDIV & BM_EDIVLD) == 0) return -2;
// make sure error flags are reset
ESTAT = BM_PVIOL | BM_ACCERR;
// check if command buffer is ready
if((ESTAT & BM_CBEIF) == 0) return -3;
// check if sector is erased
if((*dest != 0xffff) || (*(dest+1) != 0xffff)) {
// no, go erase sector
*dest = *src;
ECMD = EETS_CMD_SERASE;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return -4;
while((ESTAT & BM_CBEIF) == 0) ;
}
// program 1st word
*dest = *src;
ECMD = EETS_CMD_PROGRAM;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return -5;
while((ESTAT & BM_CBEIF) == 0) ;
// program 2nd word
*(dest+1) = *(src+1);
ECMD = EETS_CMD_PROGRAM;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return -6;
while((ESTAT & BM_CCIF) == 0) ;
return 0;
}

<snip>

//=============================================================================




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Re: EEPROM routines for MC9S12DP256 - Author Unknown - Dec 11 13:42:00 2002

Thanks, Oliver!

I went to Motorola's site and found the source and docs, this is a great
help. Oliver Thamm <>
12/11/2002 03:00 AM
Please respond to 68HC12 To:
cc:
Subject: Re: [68HC12] EEPROM routines for MC9S12DP256 Hi Dave,

the code below writes a sector (4bytes/2words) to the EEPROM of the DP256.
initEETS() must be called once during the initialization phase of your
program.

This code snippet is part of a new 'DP256 reference design, which I
prepared
for Motorola recently. The whole stuff (source code and docs) can be
downloaded
for free from Motorola web. Just go to the ACPRD Project Page and follow
the links...

Happy HC(S)12ing!
Oliver -----------------------------------------------------
*** Oliver Thamm's HC12 Web *** http://hc12web.de ***
-----------------------------------------------------
> Hi All,

> I saw a few posts regarding EEPROM routines for the MC9S12DP256 written
in
> assembly. If anyone has a set or example that they are willing to share
it
> would be a great time saver. Actually a routine in C would be ideal
> but....

> Please e-mail me at

> Thanks in advance,
> Dave Yanez
//=============================================================================
// File: S12_EETS.C - V1.00
// Rem.: The ACPRD Project Page on the Web -> http://hc12web.de/acprd
//=============================================================================

//-- Includes
-----------------------------------------------------------------

#include "datatypes.h"
#include <hcs12dp256.h>
#include "s12_eets.h"

//-- Code
---------------------------------------------------------------------

void initEETS(void) {

ECLKDIV = EETS_ECLKDIV; // set EEPROM Clock
Divider Register
}

//-----------------------------------------------------------------------------

INT8 wrSectEETS(UINT16 *dest, UINT16 *src) {

// check addr: must be aligned 32 bit
if((UINT16)dest & 0x0003) return -1;
// check if ECLKDIV was written
if((ECLKDIV & BM_EDIVLD) == 0) return -2;
// make sure error flags are reset
ESTAT = BM_PVIOL | BM_ACCERR;
// check if command buffer is ready
if((ESTAT & BM_CBEIF) == 0) return -3;
// check if sector is erased
if((*dest != 0xffff) || (*(dest+1) != 0xffff)) {
// no, go erase sector
*dest = *src;
ECMD = EETS_CMD_SERASE;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return
-4;
while((ESTAT & BM_CBEIF) == 0) ;
}
// program 1st word
*dest = *src;
ECMD = EETS_CMD_PROGRAM;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return -5;
while((ESTAT & BM_CBEIF) == 0) ;
// program 2nd word
*(dest+1) = *(src+1);
ECMD = EETS_CMD_PROGRAM;
ESTAT = BM_CBEIF;
if(ESTAT & (BM_PVIOL | BM_ACCERR)) return -6;
while((ESTAT & BM_CCIF) == 0) ;
return 0;
}

<snip>

//=============================================================================

--------------------------------------------------------
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