lh28f400su-nc Sharp Microelectronics of the Americas, lh28f400su-nc Datasheet - Page 17

• Manufacturer Part Number: lh28f400su-nc
• Description: 512k 256k Flash Memory
• Manufacturer: Sharp Microelectronics of the Americas

4M (512K × 8, 256K × 16) Flash Memory
READ COMPATIBLE
READ COMPATIBLE
STATUS REGISTER
STATUS REGISTER
WRITE CONFIRM
DATA/ADDRESS
OPERATION
WRITE 57H
COMPLETE
CSR.4, 5 =
CSR.7 =
CSR.7 =
START
0
1
1
0
0
1
(NOTE)
Figure 13. Set Write Protect
OPERATION
NOTE:
If CSR.4, 5 is set, as it is command sequence error,
should be cleared before further attempts are initiated.
Upon device power-up or toggle RP, Set Write
Protect command must be written to reflect the actual
lock-bit status.
Write FFH after the last operation to reset device to
Read Array Mode.
See Command Bus Cycle notes for description of codes.
Read
Write
Write
Read
Read
BUS
Write Protect
Set Confirm
COMMAND
Set
Check CSR.7
1 = WSM Ready
0 = WSM Busy
D = 57H
A = X
D = D0H
A = 0FFH
(A
Others = X)
Check CSR.7
1 = WSM Ready
0 = WSM Busy
Check CSR.4, 5
1 = Unsuccesful
0 = Successful
9
- A
8
= 0, A
COMMENTS
7
- A
0
= 1,
LH28F400SU-NC
28F400SUT-NC60-11
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