topic Re: HCS12X-How does DFLASH differ from EEPROM? in CodeWarrior Development Tools https://community.nxp.com/t5/CodeWarrior-Development-Tools/HCS12X-How-does-DFLASH-differ-from-EEPROM/m-p/649466#M5697 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>Earlier S12 and S12X microcontrollers contained standard EEPROM memory. The main characteristic (from the user’s point of view) is that the sector size is 4 bytes (smallest partition of memory that can be erased).</P><P>&nbsp;</P><P>Microcontrollers from S12XE and S12XF family are a little bit different. The technology has been changed – the memory size is higher but also the sector has been increased to 256 bytes. This kind of EEPROM memory is called D-Flash.</P><P>&nbsp;</P><P>There are two ways to access this memory.</P><P>The user can work with the D-Flash directly – through the standard flash commands like “Program D-Flash Command”, “Erase D-Flash Sector Command”…</P><P>&nbsp;</P><P>The next possibility is usage of Emulated EEPROM. What does it mean – the user just reads/writes data from/to Buffer RAM. The internal mechanism will ensure the data integrity between Buffer RAM and D-Flash. It automatically loads data from D-Flash to Buffer RAM after reset and automatically stores the data to D-Flash when writing to Buffer RAM. So, it’s very comfortable for user because he can use the EEPROM memory which behaves like RAM memory.</P><P>&nbsp;</P><P>This is only short description, I recommend the application note AN3490 where is the complete explanation.</P><P>&nbsp;</P><P><A href="http://www.freescale.com/files/microcontrollers/doc/app_note/AN3490.pdf">http://www.freescale.com/files/microcontrollers/doc/app_note/AN3490.pdf</A></P><P></P><P></P><P><BR />Have a great day,<BR />Jennie Zhang</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Tue, 27 Sep 2016 03:38:25 GMT ZhangJennie 2016-09-27T03:38:25Z HCS12X-How does DFLASH differ from EEPROM? https://community.nxp.com/t5/CodeWarrior-Development-Tools/HCS12X-How-does-DFLASH-differ-from-EEPROM/m-p/649465#M5696 <HTML><HEAD></HEAD><BODY><P>In most litterature and in Processor Expert the term EEPROM is used.</P><P>Sometimes however, the term DFLASH is also used.</P><P>The PE-Micro Cyclone PRO programmer has EEPROM and DFLASH programming algoritms,</P><P>suggesting that there are two different memory types.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>What is the difference between EEPROM and DFLASH?</P></BODY></HTML> Mon, 26 Sep 2016 15:53:31 GMT https://community.nxp.com/t5/CodeWarrior-Development-Tools/HCS12X-How-does-DFLASH-differ-from-EEPROM/m-p/649465#M5696 AndersJ 2016-09-26T15:53:31Z Re: HCS12X-How does DFLASH differ from EEPROM? https://community.nxp.com/t5/CodeWarrior-Development-Tools/HCS12X-How-does-DFLASH-differ-from-EEPROM/m-p/649466#M5697 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>Earlier S12 and S12X microcontrollers contained standard EEPROM memory. The main characteristic (from the user’s point of view) is that the sector size is 4 bytes (smallest partition of memory that can be erased).</P><P>&nbsp;</P><P>Microcontrollers from S12XE and S12XF family are a little bit different. The technology has been changed – the memory size is higher but also the sector has been increased to 256 bytes. This kind of EEPROM memory is called D-Flash.</P><P>&nbsp;</P><P>There are two ways to access this memory.</P><P>The user can work with the D-Flash directly – through the standard flash commands like “Program D-Flash Command”, “Erase D-Flash Sector Command”…</P><P>&nbsp;</P><P>The next possibility is usage of Emulated EEPROM. What does it mean – the user just reads/writes data from/to Buffer RAM. The internal mechanism will ensure the data integrity between Buffer RAM and D-Flash. It automatically loads data from D-Flash to Buffer RAM after reset and automatically stores the data to D-Flash when writing to Buffer RAM. So, it’s very comfortable for user because he can use the EEPROM memory which behaves like RAM memory.</P><P>&nbsp;</P><P>This is only short description, I recommend the application note AN3490 where is the complete explanation.</P><P>&nbsp;</P><P><A href="http://www.freescale.com/files/microcontrollers/doc/app_note/AN3490.pdf">http://www.freescale.com/files/microcontrollers/doc/app_note/AN3490.pdf</A></P><P></P><P></P><P><BR />Have a great day,<BR />Jennie Zhang</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Tue, 27 Sep 2016 03:38:25 GMT https://community.nxp.com/t5/CodeWarrior-Development-Tools/HCS12X-How-does-DFLASH-differ-from-EEPROM/m-p/649466#M5697 ZhangJennie 2016-09-27T03:38:25Z