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LHF32KZR
24
Start
Write 70H
Read Status
Register
Bus
Operation
Write
Read
Command
Read Status
Register
Comments
Data=70H
Addr=X
Status Register Data
Check SR.7
SR.7=
0
Standby
1=WSM Ready
0=WSM Busy
1
Write
Erase Setup
Data=20H
Addr=Within Block to be Erased
Write 20H,
Block Address
Write
Erase
Confirm
Data=D0H
Addr=Within Block to be Erased
Write D0H,
Block Address
Read Status
Register
Suspend Block
Read
Standby
Status Register Data
Check SR.7
1=WSM Ready
No
Erase Loop
0=WSM Busy
SR.7=
0
Suspend
Block Erase
Yes
Repeat for subsequent block erasures.
Full status check can be done after each block erase or after a sequence of
1
block erasures.
Write FFH after the last operation to place device in read array mode.
Full Status
Check if Desired
Block Erase
Complete
FULL STATUS CHECK PROCEDURE
Read Status Register
Data(See Above)
Bus
Operation
Command
Comments
SR.3=
1
V PP Range Error
Standby
Check SR.3
1=V PP Error Detect
0
1
Standby
Check SR.1
1=Device Protect Detect
WP#=V IL ,Block Lock-Bit is Set
Only required for systems
SR.1=
0
Device Protect Error
Standby
implementing lock-bit configuration
Check SR.4,5
Both 1=Command Sequence Error
SR.4,5=
1
Command Sequence
Error
Standby
Check SR.5
1=Block Erase Error
0
1
SR.5,SR.4,SR.3 and SR.1 are only cleared by the Clear Status
Register Command in cases where multiple blocks are erased
before full status is checked.
SR.5=
Block Erase Error
If error is detected, clear the Status Register before attempting
retry or other error recovery.
0
Block Erase Successful
Figure 5. Automated Block Erase Flowchart
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