ST10F276E
Internal Flash memory
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*/
do
/*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:
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A Sector Erase can be suspended by setting SUSP bit
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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
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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).
Doc ID 12303 Rev 3
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