LRS1331 데이터 시트보기 (PDF) - Sharp Electronics

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LRS1331

Stacked Chip 16M Flash Memory and 4M SRAM

Sharp Electronics 

LRS1331

Stacked Chip (16M Flash & 4M SRAM)

Table 5. Write Protection Alternatives

OPERATION

Block Erase or

Word Write

Full Chip Erase

Set Block

Lock-Bit

Clear Block

Lock-Bit

Set Permanent

Lock-Bit

F-VCCW

≤ VCCWLK

> VCCWLK

≤ VCCWLK

> VCCWLK

≤ VCCWLK

> VCCWLK

≤ VCCWLK

> VCCWLK

≤ VCCWLK

> VCCWLK

F-RP

PERMANENT BLOCK

LOCK-BIT LOCK-BIT

F-WP

EFFECT

X

X

X

X All blocks locked

VIL

X

VIH

X

X

X

X

X All blocks locked

0

VIL Two boot blocks locked

VIH Block Erase and Word Write enabled

1

VIL Block Erase and Word Write disabled

VIH Block Erase and Word Write disabled

X

X All blocks locked

VIL

X

VIH

X

X

X

X

X All blocks locked

VIL

All unlocked blocks are erased. Two boot

blocks and locked blocks are not erased

X

VIH

All unlocked blocks are erased. Locked blocks

are not erased

X

X Set block lock-bit disabled

VIL

X

0

VIH

1

X

X Set block lock-bit disabled

X

X Set block lock-bit enabled

X

X Set block lock-bit disabled

X

X

X

X Clear block lock-bits disabled

VIL

X

0

VIH

1

X

X Clear block lock-bits disabled

X

X Clear block lock-bits enabled

X

X Clear block lock-bits disabled

X

X

X

X Set permanent lock-bit disabled

VIL

X

VIH

X

X

X Set permanent lock-bit disabled

X

X Set permanent lock-bit enabled

6

Data Sheet

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