LHF16J04 Просмотр технического описания (PDF) - Sharp Electronics

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LHF16J04

Flash Memory 16M (1M × 16/2M × 8)

Sharp Electronics 

SHARP

LHFl6J04

16

.. 12 Block Locking by the WP#

his Boot Block Flash memory architecture features two

ardware-lockable boot blocks so that the kernel code for

le system can be kept secure while other blocks are

rogrammed or erased as necessary.

he lockable blocks are locked when WP#=V,: any

rogram or erase operation to a locked block will result in

an error. which will be reflected in the status register. FOI

top configuration. the top two boot blocks are lockable

For the bottom configuration. the bottom two boot block:

are lockable. If WP# is V,, and block lock-bit is not set

boot block can be programmed or erased normally (Unles:

Vccw is below V,,,,,). WP# is valid only two boo

blocks. other blocks are not affected.

Table 5. Write Protection Alternatives

‘1,

0

1

Set

‘VCCWLK

’

X

Permanent >VcCWLK V,

X

Lock-Bit

VI,

X

X

X Clear Block Lock-Bits Enabled.

X

X Clear Block Lock-Bits Disabled.

X

X Set Permanent Lock-Bit Disabled.

X

X Set Permanent Lock-Bit Disabled.

X

X Set Permanent Lock-Bit Enabled.

Rev. 1.25

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