topic Re: mc9s12g128 100pin erase all eeprom commad in S12 / MagniV Microcontrollers

mc9s12g128 100pin erase all eeprom commad

张华荣 — Wed, 03 Jun 2015 00:55:49 GMT

When I call the below function,the all eeprom(0x400-0x13FF) is erased and the MCU reset.Please help me.

void Eep_EraseAllEeprom(void)

{
FSTAT =0x30U; /*Before launching a command, the ACCERR and FPVIOL bits in the FSTAT registermust be clear*/

FCCOBIX = 0x00U;

FCCOB = 0x0900U; /*the Erase flash block command is 0x09*/

CCOBIX++;

FCCOB = 0x0400;

FSTAT =0x80U; /*FSTAT register (to launch command)Clear CCIF 0x80*/

}

the Init function is below:

void Eep_Init(void)

{

CLKDIV_FDIVLCK = 0x01U;

FCLKDIV_FDIV = 0x18U;

FCNFG_CCIE =0x00U;

FCNFG_IGNSF = 0x00U;

FCNFG_FDFD = 0x01U;

FCNFG_FSFD = 0x01U;

FERCNFG_DFDIE = 0x00U;

FERCNFG_SFDIE = 0x00U;

FSTAT_CCIF = 0x01U;

FSTAT_ACCERR = 0x01U;

FSTAT_FPVIOL = 0x01U;

FERSTAT_DFDIF = 0x01U;

FERSTAT_SFDIF = 0x01U;

DFPROT_DPOPEN = 0x01U; /*disable protection*/

DFPROT_DPS = 0x00U;

}

the Erase flash block is below

Re: mc9s12g128 100pin erase all eeprom commad

张华荣 — Wed, 03 Jun 2015 06:41:14 GMT

Sorry,the MCU is not reset,but the BDM
output ILLEGAL_BP,and the PC jump to a invalid address.

Re: mc9s12g128 100pin erase all eeprom commad

kef2 — Thu, 04 Jun 2015 07:02:31 GMT

Erase block command is one of Mass Erase commands. And if you look at 29.4.5 Allowed Simultaneous P-Flash and EEPROM Operations, you may notice that P-flash simultaneous Read from P-flash and Mass Erase EEPROM is not allowed. Effect of this is that P-flash is not readable while Mass Erase command is applied to EEPROM block. CPU is unable to read code (and interrupt vectors) from P-flash and runs away. You need to either use sector erase command and iterate with it over entire EEPROM array, or move parts of your code from P-flash to RAM.

Re: mc9s12g128 100pin erase all eeprom commad

张华荣 — Thu, 04 Jun 2015 07:58:00 GMT

thanks a lot,i understand!