Please observe the following general advice concerning:

Serial EEPROMs with Memory Protection Function

The Protect Register

In order to access the protect register, select "protect register" in the options menu.

After having been set, the value of the protect-register is then recorded in the data buffer after the last device address (see also: Mapping of Configuration Register in the GALEP-4 Data). The lower order 8 bit (Low Byte) area represents the register content, while the higher order (High Byte) bits area represents the F flag extended by 8 bits. The F flag indicates whether the protect-register is used. The protect-register is active when the F flag is set to null.

Write Protect Register

During programming, the value is written from the buffer to the protect-register. As write-access occurs, the F flag is set to null, automatically validating the protect-register (property of the device).

The value of the F flag given in the buffer is therefore of no consequence to the programming. During programming, the protect-register's null value for the F flag is entered in the data buffer.

Read Protect Register

While performing a read, the contents of the protect-register and the condition of the F flag are determined, and written to the data buffer.

Compare Protect Register

When the protect-register is rendered inactive by a deletion, its content initially is of no consequence for the function of the device. For that reason, during a comparison, initially the F flag is compared to the buffer checked, to verify whether it is active (null). A comparison between the protect-register and the data buffer would then be carried out only if the F flag were active.

Protecting the Protect-Register

In order to protect the protect-register, select "protect register" in the options menu.

Attention: Protecting the protect-register is an irreversible, one-time action that cannot be undone. After protecting the protect-register the device can no longer be deleted.