LH28F400SU-LC 데이터 시트보기 (PDF) - Sharp Electronics

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LH28F400SU-LC

4M (512K × 8, 256K × 16) Flash Memory

Sharp Electronics 

4M (512K × 8, 256K × 16) Flash Memory

LH28F400SU-LC

START

READ COMPATIBLE

STATUS REGISTER

CSR.7 = 0

1

WRITE 47H

WRITE CONFIRM

DATA/ADDRESS

READ COMPATIBLE

STATUS REGISTER

CSR.7 = 0

1

CSR.4, 5 = 1 (NOTE)

0

OPERATION

COMPLETE

BUS

OPERATION

COMMAND

COMMENTS

Read

Check CSR.7

1 = WSM Ready

0 = WSM Busy

Write

Reset

D = 47H

Write Protect A = X

Write

Reset

Confirm

D = D0H

A = 0FFH

(A9 - A8 = 0, A7 - A0 = 1,

Others = X)

Read

Read

Check CSR.7

1 = WSM Ready

0 = WSM Busy

Check CSR.4, 5

1 = Unsuccesful

0 = Successful

NOTE:

If CSR.4, 5 is set, as it is command sequence error,

should be cleared before further attempts are initiated.

Reset Write Protect command enables Write/Erase

operation to all blocks.

Write FFH after the last operation to reset device to

Read Array Mode.

See Command Bus Cycle notes for description of codes.

Figure 15. Reset Write Protect

28F400SUH-LC15-13

19

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