LH28F020SU-L datasheet(9/31 Pages) SHARP

Part #	LH28F020SU-L

Description	2M (256K 횞 8) Flash Memory

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Manufacturer	SHARP [Sharp Corporation]

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2M (256K × 8) Flash Memory

LH28F020SU-L

9

Figure 5. Byte Writes with Compatible Status Register

START

BUS

OPERATION

COMMAND

COMMENTS

WRITE 40H or 10H

WRITE

DATA/ADDRESS

CSR.7 =

0

1

0

1

0

1

CSR FULL STATUS

CHECK IF DESIRED

OPERATION

COMPLETE

CLEAR CSRD

RETRY/ERROR

RECOVERY

DATA WRITE

SUCCESSFUL

VPP LOW

DETECT

READ CSRD

(see above)

CSR.4, 5 =

CSR.3 =

Write

Read

Standby

Byte Write

D = 40H or 10H

A = X

D = WD

A = WA

Q = CSRD

Toggle CE or OE

to update CSRD.

A = X

Repeat for subsequent Byte Writes.

CSR Full Status Check can be done after each Byte Write,

or after a sequence of Byte Writes.

Write FFH after the last operation to reset device

to read array mode.

See Command Bus Cycle notes for description of codes.

Check CSR.7

1 = WSM Ready

0 = WSM Busy

BUS

OPERATION

COMMAND

CSR FULL STATUS CHECK PROCEDURE

COMMENTS

Standby

Check CSR.4, 5

1 = Data Write Unsuccessful

0 = Data Write Successful

Check CSR.3

1 = VPP Low Detect

0 = VPP OK

CSR.3, 4, 5 should be cleared, if set, before further attempts

are initiated.

28F020SUL15-4

READ COMPATIBLE

STATUS REGISTER

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LH28F020SU-L Datasheet(PDF) 9 Page - Sharp Corporation

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