Hello, U r allocating ur EPROM space.I'd better suggest u go thru the manuals of the cosmic, and ur linker file. this is b'cos u will hav 2 see where u r placing ur uninitialised data. By dfault, it gets stored in the .bss section, ie ur RAM. so u won't be able to read the correct(desired )value of ur variable from EEPROM. If u want to modify some variable, the variable which u r modifying shld be in RAM. U hav 2 modify ur linker file accordingly. bernd71093 <bernd71093@bern...> wrote: Hi experts, I want to access data in the EEPROM space 0xC00. The target is the S12XDP512. The compiler I use is called Cosmic v4.6. The EEPROM space definition in the linkfile looks like: ========================================================= +seg .eeprom -b 0xC00 -o 0x13FC00 -m 1024 var_eeprom.o //my file with the eeprom data //(-b: logic adr.; -o: memory adr.; -m 1k size) The var_eeprom.c file: ====================== @eeprom char warm_start; // EEPROM variable definition The main.c file: =================== extern char warm_start; ... main{ ... warm_start++; // doing something with the eeprom data ... } PROBLEM: There is no access to variable "warm_start" (no read and write is possible. The value is always the same!?! Thanks for your support!! Bernd SPONSORED LINKS Freescale semiconductor inc Microcontrollers Pic microcontrollers 8051 microprocessor --------------------------------- YAHOO! GROUPS LINKS --------------------------------- --------------------------------- Yahoo! Music Unlimited - Access over 1 million songs. Try it free.

Hi, The -b and -o values are inverted. -b is the physical address and matches the global S12X address, and -o is the logical address. You also need the @eeprom modifier on the extern declaration in your main.c file. Regards, Jean-Pierre Lavandier -----Message d'origine----- De : bernd71093 [mailto:bernd71093@bern...] Envoy: mardi 22 novembre 2005 16:52 : 68HC12@68HC... Objet : [68HC12] Placing Data Objects in EEPROM Hi experts, I want to access data in the EEPROM space 0xC00. The target is the S12XDP512. The compiler I use is called Cosmic v4.6. The EEPROM space definition in the linkfile looks like: ========================================================= +seg .eeprom -b 0xC00 -o 0x13FC00 -m 1024 var_eeprom.o //my file with the eeprom data //(-b: logic adr.; -o: memory adr.; -m 1k size) The var_eeprom.c file: ====================== @eeprom char warm_start; // EEPROM variable definition The main.c file: =================== extern char warm_start; ... main{ ... warm_start++; // doing something with the eeprom data ... } PROBLEM: There is no access to variable "warm_start" (no read and write is possible. The value is always the same!?! Thanks for your support!! Bernd SPONSORED LINKS Freescale <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Freescal e+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w451+micr oprocessor&c=4&s6&.sig=K2HGv-zFlv5OYUv_QxIq_Q> semiconductor inc Microcontrollers <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semicondu ctor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w451+microprocessor& c=4&s6&.sig=SYHwNJjjGQXRvtt_GybT4g> Pic <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale+semic onductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w451+microproces sor&c=4&s6&.sig=umVbbnUwsPzEzKKD_pQfUw> microcontrollers 8051 <http://groups.yahoo.com/gads?t=ms&k51+microprocessor&w1=Freescale+semico nductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w451+microprocess or&c=4&s6&.sig=NO-nSKjHoAlh9XtZ8LB1_A> microprocessor _____ > . _____

Bernd, You need to make sure your code (or the compiler initialization) is initializing the ECLKDIV - EEPROM Clock Divider Register to the appropriate divide value, so the EEPROM erasing and programming algorithms work well. The appropriate ECLKDIV register setting depends on clock frequency, so the Compiler probably needs you to specify it explicitly. Hope this helps, Doron Nohau HC12 In-Circuit Emulators www.nohau.com/emul12pc.html At 15:51 22/11/2005 +0000, you wrote: >Hi experts, > >I want to access data in the EEPROM space 0xC00. The target is the >S12XDP512. The compiler I use is called Cosmic v4.6. > >The EEPROM space definition in the linkfile looks like: >========================================================= >+seg .eeprom -b 0xC00 -o 0x13FC00 -m 1024 >var_eeprom.o //my file with the eeprom data //(-b: logic adr.; -o: >memory adr.; -m 1k size) >The var_eeprom.c file: >====================== >@eeprom char warm_start; // EEPROM variable definition > >The main.c file: >=================== >extern char warm_start; >... >main{ >... >warm_start++; // doing something with the eeprom data >... >} >PROBLEM: >There is no access to variable "warm_start" (no read and write is >possible. The value is always the same!?! > >Thanks for your support!! > >Bernd

Hi experts, I want to access data in the EEPROM space 0xC00. The target is the S12XDP512. The compiler I use is called Cosmic v4.6. The EEPROM space definition in the linkfile looks like: ========================================================= +seg .eeprom -b 0xC00 -o 0x13FC00 -m 1024 var_eeprom.o //my file with the eeprom data //(-b: logic adr.; -o: memory adr.; -m 1k size) The var_eeprom.c file: ====================== @eeprom char warm_start; // EEPROM variable definition The main.c file: =================== extern char warm_start; ... main{ ... warm_start++; // doing something with the eeprom data ... } PROBLEM: There is no access to variable "warm_start" (no read and write is possible. The value is always the same!?! Thanks for your support!! Bernd