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Flash program memory and data EEPROM (FLASH) RM0367

88/1043 RM0367 Rev 7

Erase Option bytes

• Purpose

Delete one row in the Option bytes area. This operation performs the same function as

Write Option Byte with a zero value. It is available for compatibility purpose only.

• Size

Erase only by word.

• Address

Select a valid address in the Option bytes area.

• Protocol

Single programming operation.

• Requests

PELOCK = 0, OPTLOCK = 0, ERASE = 1 (optional OPT = 1).

• Errors

WRPERR is set to 1 if PELOCK = 1 or OPTLOCK = 1.

WRPERR is set to 1 if the actual protection level is 2 (the Option bytes area cannot be

erased at Level 2).

SIZERR is set to 1 if the size is not the word.

• Description

This operation aims at deleting the content of a row in the Option bytes area. A row

contains only 1 word. The use must write zero at the right address with a word size.

Refer to Section : Write Option bytes for additional information.

Since all bits are set to 0 after an erase operation, there will be a mismatch during the

Option bytes loading and the default values will be loaded.

• Duration

Tprog (3.2 ms).

For code example, refer to A.3.8: Erase Option byte code example.

ST STM32L0x3 User Manual

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