MX25L8008E Ver la hoja de datos (PDF) - Macronix International

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MX25L8008E

8M-BIT [x 1 / x 2] CMOS SERIAL FLASH

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MX25L8008E

Table 5. Protection Modes

Mode

Software protection

mode (SPM)

Status register condition

Status register can be written

in (WEL bit is set to "1") and

the SRWD, BP2-BP0

bits can be changed

Hardware protection

mode (HPM)

The SRWD, BP2-BP0 of

status register bits cannot be

changed

WP# and SRWD bit status

WP#=1 and SRWD bit=0, or

WP#=0 and SRWD bit=0, or

WP#=1 and SRWD=1

WP#=0, SRWD bit=1

Memory

The protected area

cannot

be program or erase.

The protected area

cannot

be program or erase.

Note:

1. As defined by the values in the Block Protect (BP2-BP0) bits of the Status Register, as shown in "Table 2. Pro-

tected Area Sizes".

As the above table showing, the summary of the Software Protected Mode (SPM) and Hardware Protected Mode (HPM).

Software Protected Mode (SPM):

- When SRWD bit=0, no matter WP# is low or high, the WREN instruction may set the WEL bit and can change

the values of SRWD, BP2-BP0. The protected area, which is defined by BP2-BP0 is at software protected mode

(SPM).

- When SRWD bit=1 and WP# is high, the WREN instruction may set the WEL bit can change the values of

SRWD, BP2-BP0. The protected area, which is defined by BP2-BP0, is at software protected mode (SPM).

Note: If SRWD bit=1 but WP# is low, it is impossible to write the Status Register even if the WEL bit has previously

been set. It is rejected to write the Status Register and not be executed.

Hardware Protected Mode (HPM):

- When SRWD bit=1, and then WP# is low (or WP# is low before SRWD bit=1), it enters the hardware protected

mode (HPM). The data of the protected area is protected by software protected mode by BP2-BP0 and hardware

protected mode by the WP# to against data modification.

Note: to exit the hardware protected mode requires WP# driving high once the hardware protected mode is entered.

If the WP# pin is permanently connected to high, the hardware protected mode can never be entered; only can use

software protected mode via BP2-BP0.

P/N: PM1944

REV. 1.1, DEC. 10, 2013

17

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