ST10F296 datasheet(61/346 Pages) STMICROELECTRONICS

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Internal Flash memory

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5.4.3

Write protection

The Flash modules have one level of write protection. Each sector of each bank of each

Flash module can be software write protected by programming the related WyPx bit of the

FNVWPXRH/L-FNVWPIRH/L registers at 0.

5.4.4

Temporary unprotection

Bits WyPx of the FNVWPXRH/L-FNVWPIRH/L registers can be temporary unprotected by

executing the set protection operation and writing 1 into these bits.

Bit ACCP can be temporarily unprotected by executing the set protection operation and

writing 1 into these bits, bu,t only if these write instructions are executed from the Flash

modules.

To restore the write and access protection bits or to execute a set protection operation and

write 0 into the desired bits, the microcontroller must be reset.

It is not necessary to temporarily unprotect an access protected Flash to update the code. it

is sufficient to execute the updating instructions from another Flash bank.

When a temporary unprotection operation is executed, the corresponding volatile register is

written to 1, while the non-volatile registers bits previously written to 0 (for a protection set

operation), continue to maintain the 0. For this reason, the user software must track the

current protection status (for example, by using a specific RAM area), as it is not possible to

deduce it by reading the non-volatile register content (a temporary unprotection cannot be

detected).

Table 33.

Summary of access protection levels

Read IFlash/

jump to IFlash

Read XFlash/

jump to XFlash

Read Flash

registers

Write Flash

registers

Fetching from IFlash

Yes/Yes

Yes

Fetching from XFlash

No/Yes

Yes/Yes

Yes

Fetching from IRAM

No/Yes

Yes/Yes

Yes

Fetching from XRAM

No/Yes

Yes/Yes

Yes

Fetching from external memory

No/Yes

Yes/Yes

Yes

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