LH28F004SU-NC
4M (512K × 8) Flash Memory
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 12. Set Write Protect
28F004SUT-NC80-11
16