ST10F271B datasheet(43/180 Pages) STMICROELECTRONICS

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ST10F271B/ST10F271E

Internal Flash memory

43/180

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 FNVWPIR in FARL*/

FARH

= 0x0008;

/*Load Add of register FNVWPIR in FARH*/

FDR0L

= 0xFFF0;

/*Load Data in FDR0L*/

FDR0H

= 0xFFFF;

/*Load Data in FDR0H*/

FCR0H

|= 0x8000;

/*Operation start*/

Example 2: Enable Access and Debug Protection.

FCR0H

|= 0x0100;

/*Set SPR in FCR0H*/

FARL

= 0xDFB8;

/*Load Add of register FNVAPR0 in FARL*/

FARH

= 0x0008;

/*Load Add of register FNVAPR0 in FARH*/

FDR0L

= 0xFFFC;

/*Load Data in FDR0L*/

FCR0H

|= 0x8000;

/*Operation start*/

Example 3: Disable in a permanent way Access and Debug Protection.

XFVTAUR0

= 0x0001;

/*Set TAUB in XFVTAUR0*/

FCR0H

|= 0x0100;

/*Set SPR in FCR0H*/

FARL

= 0xDFBC;

/*Load Add of register FNVAPR1L in FARL*/

FARH

= 0x0008;

/*Load Add of register FNVAPR1L in FARH*/

FDR0L

= 0xFFFE;

/*Load Data in FDR0L for clearing PDS0*/

FCR0H

|= 0x8000;

/*Operation start*/

Example 4: Enable again in a permanent way Access and Debug Protection, after having

disabled them.

XFVTAUR0

= 0x0001;

/*Set TAUB in XFVTAUR0*/

FCR0H

|= 0x0100;

/*Set SPR in FCR0H*/

FARL

= 0xDFBC;

/*Load Add register FNVAPR1H in FARL*/

FARH

= 0x0008;

/*Load Add register FNVAPR1H in FARH*/

FDR0H

= 0xFFFE;

/*Load Data in FDR0H for clearing

PEN0*/

FCR0H

|= 0x8000;

/*Operation start*/

XFVTAUR0

= 0x0000;

/*Reset TAUB in XFVTAUR0*/

Disable and re-enable of Access and Debug Protection in a permanent way (as shown by

examples 3 and 4) can be done for a maximum of 16 times.

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