XC2000 datasheet(95/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-33

V1.0, 2007-06

MemoryX2K, V1.1

“Reset to Read” command, it is interpreted as password and the reset is not executed.

The 16-bit passwords are internally compared with the keywords out of the “Security

Page 0”. If one or more passwords are not identical to their related keywords, the

protected sectors remain in the locked state and a protection error (PROER) is indicated

in the Flash status register. In this case, a new “Disable Read Protection” command or

a “Disable Write Protection” command is only accepted after the next Application

Reset.

Note: During execution of the “Disable Read” (or Write) Protection command a

password compare error is only indicated after all four passwords have been

compared with the related keywords.

Note: This command sequence is also used to check the correctness of keywords

before the protection is confirmed in the Security Page 1. A wrong keyword is

indicated by the IMB_FSR flag PROER.

After correct execution of this command, the whole flash memory is unlocked and the

read protection disable bit RPRODIS is set in the Flash Status Register (IMB_FSR).

Erase and program operations on all sectors are then possible, if the flash memory was

also globally write protected (WPA=1), and if they are not separately write protected. The

read protection (including global write protection, if so selected) remains disabled until

the command “Re-Enable Read/Write Protection” is executed, or until the next

Application Reset (including HW and SW reset).

Disable Write Protection

Arguments: PWD

Definition:

MOV XX3CH, XXXXH

MOV XX54H, PWD0

MOV XXAAH, PWD1

MOV XX54H, PWD2

MOV XXAAH, PWD3

MOV XX5AH, XX05H

Timing: 6-cycle command that does not set any busy flag.

Description: Disable temporarily the global flash write protection or/and the sector write

protection of all protected sectors. The WPA bit in IMB_IMBCTR is reset.

This is a protected command sequence, using four user defined passwords to release

this command (as described above for the “Disable Read Protection” command).

After correct execution of this command, all write-protected sectors are unlocked, which

is indicated in the Flash Status Register (IMB_FSR) with the WPRODIS bit. Erase and

program operations on all sectors are now possible, until

•

The command “Re-Enable Read/Write Protection” is executed, or

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