ST10F271Z1T3 datasheet(40/185 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F271Z1

40/185

Then the operation can be resumed in the following way:

FCR0H

|= 0x0800;

/*Set SER in FCR0H*/

FCR0H

|= 0x8000;

/*Operation resume*/

Before resuming a suspended erase, FCR1H/FCR1L must be read to check if the erase is

already completed (FCR1H = FCR1L = 0x0000 if erase is complete). Original setup of select

operation bits in FCR0H/L must be restored before the operation resume, otherwise the

operation is aborted and bit RESER of FER is set.

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 B0F1 of IFlash module.

FCR0H

|= 0x0800;

/*Set SER in FCR0H*/

FCR1L

|= 0x0002;

/*Set B0F1*/

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 0x045554 in IFlash module.

FCR0H

&= 0xBFFF;

/*Rst SUSP in FCR0H*/

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

FARL

= 0x5554;

/*Load Add in FARL*/

FARH

= 0x0004;

/*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.

In summary:

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.

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