LH28F008SC datasheet(15/38 Pages) SHARP

15 / 38 page

8M (1M × 8) Flash Memory

LH28F008SC

Figure 7. Automated Byte Write Flowchart

START

BUS

OPERATION

COMMAND

COMMENTS

WRITE 40H

ADDRESS

READ STATUS

SR.7 =

YES

ERASE SUSPEND

WRITE LOOP

FULL STATUS

CHECK IF DESIRED

BYTE WRITE

COMPLETED

BYTE WRITE

SUCCESSFUL

VPP RANGE

ERROR

DEVICE

PROTECT

ERROR

READ STATUS

(see above)

SUSPEND

BYTE

WRITE?

SR.3 =

SR.1 =

Write

Read

Setup

Byte Write

Byte

Write

Data = 40H

Addr = Location to be written

Data = Data to be written

Addr = Location to be written

Status Register Data

Standy

Check SR.7

1 = WSM Ready

0 = WSM Busy

Repeat for subsequent byte writes.

SR full status check can be done after each byte write or

after a sequence of byte writes.

Write FFH after the last byte write operation to place

device in read array mode.

BUS

OPERATION

COMMAND

FULL STATUS CHECK PROCEDURE

COMMENTS

Standby

Check SR.3

1 = VPP Low Detect

Check SR.1

1 = Device Protect Detect

RP = VIH Block Lock-Bit is Set

Only required for systems

implemening lock-bit

configuration

Check SR.4

1 = Data Write Error

SR.4, SR.3 and SR.1 are only cleared by the Clear Status

before full status is checked.

If error is detected, clear the Status Register before attempting

retry or other error recovery.

28F008SC-7

WRITE BYTE DATA

AND ADDRESS

SR.4 =

BYTE WRITE

ERROR

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