LH28F008SA datasheet(16/35 Pages) SHARP

16 / 35 page

LH28F400SU-NC

4M (512K × 8, 256K × 16) Flash Memory

Figure 12. Erase All Unlocked Blocks with Compatible Status Registers

28F400SUT-NC60-10

START

(NOTE)

BUS

OPERATION

COMMAND

COMMENTS

WRITE A7H

CSR.7 =

YES

CSR FULL STATUS

CHECK IF DESIRED

OPERATION

COMPLETE

WRITE D0H

CLEAR CSRD

RETRY/ERROR

RECOVERY

(NOTE)

ERASE

SUCCESSFUL

VPP LOW

DETECT

READ CSRD

(see above)

SUSPEND

ERASE

SUSPEND

ERASE LOOP

CSR.4, 5 =

CSR.3 =

Write

Read

Standby

Erase All

Unlocked

Blocks

Confirm

D = A7H

A = X

D = D0H

A = X

Q = CSRD

Toggle CE or OE

to update CSRD

A = X

CSR Full Status Check can be done after Erase All Unlocked

Block, or after a sequence of Erasures.

Write FFH after the last operation to reset

device to read array mode.

See Command Bus Cycle notes for description of codes.

NOTE:

Where power off or RP is set low during erase operation,

1. Clear CSR.3/4/5 and issue Reset WP command,

2. Retry Erase All Unlocked Block Erase command to

erase all blocks, or issue Single Block Erase to

erase all of the unlocked blocks in sequence.

3. Set WP command is issued, if necessary.

Check CSR.7

1 = WSM Ready

0 = WSM Busy

BUS

OPERATION

COMMAND

CSR FULL STATUS CHECK PROCEDURE

COMMENTS

Standby

Check CSR.4, 5

1 = Erase Error

0 = Erase Successful

Both 1 = Command

Sequence Error

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

are initiated.

NOTE:

If CSR.3 (VPPS) is set to '1', after clearing CSR.3/4/5,

1. Issue Reset WP command,

2. Retry Erase All Unlocked Block Erase command to erase

all blocks, or issue Single Block Erase to erase all of the

unlocked blocks in sequence.

3. Set WP command is issued, if necessary.

If CSR.3 (VPPS) is set to '0', after clearing CSR.3/4/5,

1. Retry Erase All Unlocked Block Erase command.

READ COMPATIBLE

STATUS REGISTER

Check CSR.3

1 = VPP Low Detect

0 = VPP OK

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