ST10F276Z5 datasheet(44/239 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F276Z5

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Erase suspend, program and resume

A Sector Erase operation can be suspended in order to program (Word or Double Word)

another Sector.

Example: Sector Erase of sector B3F1 of Bank 3 in XFLASH Module.

FCR0H|= 0x0800;/*Set SER in FCR0H*/

FCR1H|= 0x0002;/*Set B3F1*/

FCR0H|= 0x8000;/*Operation start*/

Example: Sector Erase Suspend.

FCR0H|= 0x4000;/*Set SUSP in FCR0H*/

/*Loop to wait for LOCK=0 and WMS=0*/

{tmp1 = FCR0L;

tmp2 = FCR0H;

} while ((tmp1 && 0x0010) || (tmp2 && 0x8000));

Example: Word Program of data 0x5555AAAA at address 0x0C5554 in XFLASH module.

FCR0H&= 0xBFFF;/*Rst SUSP in FCR0H*/

FCR0H|= 0x2000;/*Set WPG in FCR0H*/

FARL = 0x5554; /*Load Add in FARL*/

FARH = 0x000C; /*Load Add in FARH*/

FDR0L = 0xAAAA; /*Load Data in FDR0L*/

FDR0H = 0x5555; /*Load Data in FDR0H*/

FCR0H|= 0x8000; /*Operation start*/

Once the Program operation is finished, the Erase operation can be resumed in the

following way:

FCR0H|= 0x0800;/*Set SER in FCR0H*/

FCR0H|= 0x8000;/*Operation resume*/

Notice that during the Program Operation in Erase suspend, bits SER and SUSP are low. A

Word or Double Word Program during Erase Suspend cannot be suspended.

To summarize:

–

A Sector Erase can be suspended by setting SUSP bit

–

To perform a Word Program operation during Erase Suspend, firstly bits SUSP

and SER must be reset, then bit WPG and WMS can be set

–

To resume the Sector Erase operation bit SER must be set again

–

In any case it is forbidden to start any write operation with SUSP bit already set

Set protection

Example 1: Enable Write Protection of sectors B0F3-0 of Bank 0 in IFLASH module.

FCR0H|= 0x0100;/*Set SPR in FCR0H*/

FARL = 0xDFB4;/*Load Add of register FNVWPIRL in FARL*/

FARH = 0x000E;/*Load Add of register FNVWPIRL in FARH*/

FDR0L = 0xFFF0;/*Load Data in FDR0L*/

FDR0H = 0xFFFF;/*Load Data in FDR0H*/

FCR0H|= 0x8000;/*Operation start*/

Notice that bit SMOD of FCR0H must not be set, since Write Protection bits of IFLASH

Module are stored in Test-Flash (XFLASH Module).

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