LH28F400SUT-NC80 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LH28F400SUT-NC80' PDF : 35 Pages View PDF
4M (512K × 8, 256K × 16) Flash Memory
LH28F400SU-NC
START
READ COMPATIBLE
STATUS REGISTER
CSR.7 = 0
1
WRITE 57H
WRITE CONFIRM
DATA/ADDRESS
READ COMPATIBLE
STATUS REGISTER
CSR.7 = 0
1
CSR.4, 5 = 1 (NOTE)
0
OPERATION
COMPLETE
BUS
OPERATION
COMMAND
COMMENTS
Read
Check CSR.7
1 = WSM Ready
0 = WSM Busy
Write
Write
Set
D = 57H
Write Protect A = X
Set Confirm
D = D0H
A = 0FFH
(A9 - A8 = 0, A7 - A0 = 1,
Others = X)
Read
Read
Check CSR.7
1 = WSM Ready
0 = WSM Busy
Check CSR.4, 5
1 = Unsuccesful
0 = Successful
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.
Figure 13. Set Write Protect
28F400SUT-NC60-11
17
Share Link: 
