LH28F004SU-Z9 View Datasheet(PDF) - Sharp Electronics

Part Name

Description

Manufacturer

LH28F004SU-Z9

4M (512 × 8) Flash Memory

Sharp Electronics 

4M (512K × 8) Flash Memory

LH28F004SU-Z9

START

READ COMPATIBLE

STATUS REGISTER

CSR.7 = 0

1

RESET WP

READ COMPATIBLE

STATUS REGISTER

CSR.7 = 0

1

WRITE 77H

WRITE D0H AND

BLOCK ADDRESS

READ COMPATIBLE

STATUS REGISTER

0

CSR.7 =

BUS

OPERATION

COMMAND

COMMENTS

Read

Q = CSRD

Toggle CE or OE

to update CSRD.

1 = WSM Ready

0 = WSM Busy

Write

Reset

After Write D = 47H A = X,

Write Protect Write D = D0H A = 0FFH

Read

Q = CSRD

Toggle CE or OE

to update CSRD.

1 = WSM Ready

0 = WSM Busy

Write

Lock Block D = 77H

A=X

Write

Confirm

D = D0H

A = BA

Read

Q = CSRD

Toggle CE or OE

to update CSRD.

1 = WSM Ready

0 = WSM Busy

Write

Set

After Write D = 57H A = X,

Write Protect Write D = D0H A = 0FFH

NOTE:

See CSR Full Status Check for Data-Write operation.

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

should be cleared before further attempts are initiated.

Write FFH after the last operation to reset device to read

array mode.

See Command Bus Definitions for description of codes.

1

1 (NOTE)

CSR.4, 5 =

0

LOCK

ANOTHER

YES

BLOCK?

NO

SET WP

OPERATION COMPLETE

Figure 7. Block Locking Scheme

28F004SU-Z9-7

11

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